! Proposal 6759, submission 1 ! PI: Dr. Jochen Eisloeffel ! Received Wed Feb 14 11:56:09 EST 1996 ! From: eisloeff@sun1 ! +====================+ ! | PED OUTPUT PRODUCT | ! +====================+ ! ! /export/home2/eisloeff/RPS2/jochen/6759.prop ! Generated by PREPROCESSOR, version 6.0e ! Date: Wed Feb 14 17:49:05 MET 1996 Proposal_Information Title: Imaging Arcsecond Scale Jets from Young Stars Proposal_Category: GO Scientific_Category: BINARIES AND STAR FORMATION Cycle: 6 Investigators PI_Name: Dr. Jochen Eisloeffel PI_Institution: Thueringer Landessternwarte Tautenburg CoI_Name: Dr. R. Mundt CoI_Institution: Max-Planck-Institut fuer Astronomie Contact: CoI_Name: Dr. T. Ray CoI_Institution: Dublin Institute for Advanced Studies Contact: CoI_Name: Dr. M. Camenzind CoI_Institution: Landessternwarte, Heidelberg Contact: Abstract: Although extended jets from young stellar objects (YSOs) represent a rather dramatic demonstration of the outflow phenomenon common to pre-main sequence stars, statistically this phase is short-lived with respect to the classical T Tauri phase. Generally speaking, it is the more heavily extincted, or even embedded, T Tauri stars that display such jets. Recently however we have found evidence that the jet phenomenon may be much more universal than previously thought. A long-slit spectroscopic survey by us now strongly suggests that the high velocity forbidden emission lines seen in many classical T Tauri stars arise from arcsecond or subarcsecond scale jets. The nature of these jets, even their morphology, is however not known even though they are much more common than their extended counterparts. We propose here to carry out the first detailed study of this phenomenon, a task that can only be undertaken using HST. Our proposal concentrates on imaging certain T Tauri stars in the nearby Taurus Auriga Dark Cloud where, on the basis of ground-based observations and theory, one stands an excellent chance of resolving these jets with the PC of the WFPC2. Our targets have also been specially chosen to give us additional information on the evolution of jets in close binaries, a topic about which virtually nothing is known. Questions Observing_Description: YSO jets are only seen in line emission, most of which is of relatively low excitation, i.e. these jets emit most of their light in lines like [OI]Lambda6300 and [SII]LambdaLambda6716,6731. They can be distinguished from any associated reflection nebula by imaging in both line emission and nearby continuum filters. The continuum images can then be subtracted from the ``line+continuum'' frames to yield a ``pure'' emission line frame. We propose to apply this subtraction method by using the filters F631N ([OI]), F656N (HAlpha), and F673N ([SII]) as line filters, and the filters F569W and F791W as continuum filters. Because of its higher critical density, and because we expect electron densities N_e > 10^5 cm^-3 close to the source (i.e. less than about 0.3 arcsec), the [OI] line is particularly suited for imaging jets which can probably be traced close to the source. The [SII] filter is more appropriate for extended features (i.e. on scales greater than about 0.3 arcsec) or for cases where the central star is presumably occulted by a circumstellar disk, as suspected for FS Tau A and B on the basis of the HST images of HH30. The HAlpha images will be used in conjunction with the forbidden line images to measure excitation. It is hoped also that by imaging the jets in these different emission lines we will also seen evidence for differential cooling. Our targets (FS Tau, UZ Tau) are hierarchical TTS triple systems, where the third star is 20 arcsec and 4 arcsec from the close binary, which has a separation of about 0.3 arcsec for both objects. Thus in these cases our imaging is essentially confined to the PC. Our choice of exposure times and the number of orbits required are based on ground-based measurements of the jet fluxes. Typical integrated intensities of these jets per square arcsecond in HAlpha are 10^-15 ergs cm^-2 s^-1 arcsec^-2 with similar integrated intensities per square arcsecond in the other lines. UZ Tau will only be imaged in the [OI] 6300 line and in the continuum (using filter F569W), since its jet is 5 to 10 times fainter in the [SII] 6716,6731 lines and since in HAlpha imaging is not so suitable because of the strong stellar HAlpha emission component. In addition to two long exposures several short exposures in both the [OI] line and in the continuum will be necessary to avoid saturation of the sources and in order to trace the jet as close as possible to the source. Two orbits will be used for this part of the programme. The close binary FS Tau A and the classical jet source FS Tau B will be imaged simultaneously with PC and WFC, respectively. Since the sources are much fainter and extended due to strong reflection nebulae, saturation is far less a problem than with UZ Tau. The FS Tau region will be imaged in both HAlpha and [SII], and in F569W and F791W as continuum filters. Since the reflection nebulae are expected to have stong colour gradients (as observed in the HST images of HL Tau) imaging at two continuum wavelengths is necessary for a proper correction of the continuum contribution in the emission line filters. Three exposures in all four filters will be carried out for this region requiring a total of four orbits. Our targets have similar declinations so the visibility time is in all cases about 53 minutes. Real_Time_Justification: No special requirements. No supporting observations. Calibration_Justification: Additional_Comments: Fixed_Targets Target_Number: 1 Target_Name: FS-TAU Alternate_Names: GSC1824-00287,Haro-6-5A Description: STAR,T TAURI STAR,WIND,JET,ISM,HERBIG-HARO OBJECT,REFLECTION NEBULA,BIPOLAR OUTFLOW,WIND,JET Position: RA=4H 22M 2.16S +/- 0.3",DEC=26D 57' 31.5" +/- 0.3",PLATE-ID=000L Equinox: J2000 RV_or_Z: RA_PM: 0.0 Dec_PM: 0.0 Epoch: J1983.020 Annual_Parallax: 0.0 Flux: V = 14.58+/-0.40 B-V = +1.37 TYPE=M1 Comments: coordinates are from GSC; source is known to be variable in the range V = 14.1 - 17.6 mag; triple system: very close binary and a third star at a distance of 20 arcsec; Target_Number: 2 Target_Name: UZ-TAU Alternate_Names: GSC1833-00271 Description: STAR,T TAURI STAR,WIND,JET,ISM,HERBIG-HARO OBJECT,REFLECTION NEBULA,BIPOLAR OUTFLOW,WIND,JET Position: RA=4H 32M 42.96S +/- 0.3",DEC=25D 52' 31.8" +/- 0.3",PLATE-ID=000L Equinox: J2000 RV_or_Z: RA_PM: 0.0 Dec_PM: 0.0 Epoch: J1983.020 Annual_Parallax: 0.0 Flux: V = 12.86 B-V = +1.19 TYPE=M3V Comments: coordinates are from GSC; source is known to be variable in the range V = 11.7 to 15.0 mag; triple system: very close binary and a third star at a distance of 4 arcsec; Solar_System_Targets Generic_Targets Scan_Data Visits Visit_Number: 01 Visit_Requirements: ORIENT 240D TO 285D On_Hold_Comments: Visit_Comments: Description of position of target and possible orientation angles: The target should be placed at 10.7, 10.7 arcsec from the centre of the PC towards the apex of the 4 CCDs. The orientation angle for the U3 axis should be in the range from 240 to 285 degrees from north over east, OR from 95 to 110 degrees from north over east, OR from 140 to 155 degrees from north over east. Exposure_Number: 10 Target_Name: FS-TAU Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F569W Wavelength: Optional_Parameters: ATD-GAIN=15 Number_of_Iterations: 1 Time_Per_Exposure: 100S Special_Requirements: POS TARG -10.7,-10.7 NO SPLIT MIN DUR MAX DUR Comments: Exposure_Number: 20 Target_Name: FS-TAU Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F569W Wavelength: Optional_Parameters: ATD-GAIN=15 Number_of_Iterations: 1 Time_Per_Exposure: 100S Special_Requirements: SAME POS AS 10 NO SPLIT MIN DUR MAX DUR Comments: Exposure_Number: 30 Target_Name: FS-TAU Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F569W Wavelength: Optional_Parameters: ATD-GAIN=15 Number_of_Iterations: 1 Time_Per_Exposure: 100S Special_Requirements: SAME POS AS 10 NO SPLIT MIN DUR MAX DUR Comments: Exposure_Number: 40 Target_Name: FS-TAU Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F791W Wavelength: Optional_Parameters: ATD-GAIN=15 Number_of_Iterations: 1 Time_Per_Exposure: 100S Special_Requirements: SAME POS AS 10 NO SPLIT MIN DUR MAX DUR Comments: Exposure_Number: 50 Target_Name: FS-TAU Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F791W Wavelength: Optional_Parameters: ATD-GAIN=15 Number_of_Iterations: 1 Time_Per_Exposure: 100S Special_Requirements: SAME POS AS 10 NO SPLIT MIN DUR MAX DUR Comments: Exposure_Number: 60 Target_Name: FS-TAU Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F791W Wavelength: Optional_Parameters: ATD-GAIN=15 Number_of_Iterations: 1 Time_Per_Exposure: 100S Special_Requirements: SAME POS AS 10 NO SPLIT MIN DUR MAX DUR Comments: Exposure_Number: 70 Target_Name: FS-TAU Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F656N Wavelength: Optional_Parameters: CR-SPLIT=no,ATD-GAIN=15 Number_of_Iterations: 1 Time_Per_Exposure: 1200S Special_Requirements: SAME POS AS 10 NO SPLIT MIN DUR MAX DUR 1500S Comments: Exposure_Number: 80 Target_Name: FS-TAU Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F656N Wavelength: Optional_Parameters: CR-SPLIT=no,ATD-GAIN=15 Number_of_Iterations: 1 Time_Per_Exposure: 1200S Special_Requirements: SAME POS AS 10 NO SPLIT MIN DUR MAX DUR 1500S Comments: Exposure_Number: 90 Target_Name: FS-TAU Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F656N Wavelength: Optional_Parameters: CR-SPLIT=no,ATD-GAIN=15 Number_of_Iterations: 1 Time_Per_Exposure: 1200S Special_Requirements: SAME POS AS 10 NO SPLIT MIN DUR MAX DUR 1500S Comments: Exposure_Number: 100 Target_Name: FS-TAU Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F673N Wavelength: Optional_Parameters: CR-SPLIT=no,ATD-GAIN=15 Number_of_Iterations: 1 Time_Per_Exposure: 1200S Special_Requirements: SAME POS AS 10 NO SPLIT MIN DUR MAX DUR 1500S Comments: Exposure_Number: 110 Target_Name: FS-TAU Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F673N Wavelength: Optional_Parameters: CR-SPLIT=no,ATD-GAIN=15 Number_of_Iterations: 1 Time_Per_Exposure: 1200S Special_Requirements: SAME POS AS 10 NO SPLIT MIN DUR MAX DUR 1500S Comments: Exposure_Number: 120 Target_Name: FS-TAU Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F673N Wavelength: Optional_Parameters: CR-SPLIT=no,ATD-GAIN=15 Number_of_Iterations: 1 Time_Per_Exposure: 1200S Special_Requirements: SAME POS AS 10 NO SPLIT MIN DUR MAX DUR 1500S Comments: Exposure_Number: 130 Target_Name: FS-TAU Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F673N Wavelength: Optional_Parameters: CR-SPLIT=no,ATD-GAIN=15 Number_of_Iterations: 1 Time_Per_Exposure: 1200S Special_Requirements: SAME POS AS 10 NO SPLIT MIN DUR MAX DUR 1500S Comments: Visit_Number: 02 Visit_Requirements: On_Hold_Comments: Visit_Comments: Exposure_Number: 10 Target_Name: UZ-TAU Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F569W Wavelength: Optional_Parameters: ATD-GAIN=15 Number_of_Iterations: 1 Time_Per_Exposure: 10S Special_Requirements: NO SPLIT MIN DUR MAX DUR Comments: Exposure_Number: 20 Target_Name: UZ-TAU Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F569W Wavelength: Optional_Parameters: ATD-GAIN=15 Number_of_Iterations: 1 Time_Per_Exposure: 10S Special_Requirements: SAME POS AS 10 NO SPLIT MIN DUR MAX DUR Comments: Exposure_Number: 30 Target_Name: UZ-TAU Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F569W Wavelength: Optional_Parameters: ATD-GAIN=15 Number_of_Iterations: 1 Time_Per_Exposure: 10S Special_Requirements: SAME POS AS 10 NO SPLIT MIN DUR MAX DUR Comments: Exposure_Number: 40 Target_Name: UZ-TAU Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F569W Wavelength: Optional_Parameters: ATD-GAIN=15 Number_of_Iterations: 1 Time_Per_Exposure: 10S Special_Requirements: SAME POS AS 10 NO SPLIT MIN DUR MAX DUR Comments: Exposure_Number: 50 Target_Name: UZ-TAU Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F569W Wavelength: Optional_Parameters: ATD-GAIN=15 Number_of_Iterations: 1 Time_Per_Exposure: 10S Special_Requirements: SAME POS AS 10 NO SPLIT MIN DUR MAX DUR Comments: Exposure_Number: 60 Target_Name: UZ-TAU Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F569W Wavelength: Optional_Parameters: ATD-GAIN=15 Number_of_Iterations: 1 Time_Per_Exposure: 30S Special_Requirements: SAME POS AS 10 NO SPLIT MIN DUR MAX DUR 40S Comments: Exposure_Number: 70 Target_Name: UZ-TAU Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F631N Wavelength: Optional_Parameters: ATD-GAIN=15 Number_of_Iterations: 1 Time_Per_Exposure: 300S Special_Requirements: SAME POS AS 10 NO SPLIT MIN DUR MAX DUR Comments: Exposure_Number: 80 Target_Name: UZ-TAU Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F631N Wavelength: Optional_Parameters: ATD-GAIN=15 Number_of_Iterations: 1 Time_Per_Exposure: 300S Special_Requirements: SAME POS AS 10 NO SPLIT MIN DUR MAX DUR Comments: Exposure_Number: 90 Target_Name: UZ-TAU Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F631N Wavelength: Optional_Parameters: CR-SPLIT=no,ATD-GAIN=15 Number_of_Iterations: 1 Time_Per_Exposure: 900S Special_Requirements: SAME POS AS 10 END ORBIT NO SPLIT MIN DUR MAX DUR 1200S Comments: Exposure_Number: 200 Target_Name: UZ-TAU Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F569W Wavelength: Optional_Parameters: ATD-GAIN=15 Number_of_Iterations: 1 Time_Per_Exposure: 30S Special_Requirements: SAME POS AS 10 NO SPLIT MIN DUR MAX DUR 40S Comments: Exposure_Number: 210 Target_Name: UZ-TAU Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F569W Wavelength: Optional_Parameters: ATD-GAIN=15 Number_of_Iterations: 1 Time_Per_Exposure: 30S Special_Requirements: NO SPLIT MIN DUR MAX DUR 40S Comments: Exposure_Number: 220 Target_Name: UZ-TAU Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F569W Wavelength: Optional_Parameters: ATD-GAIN=15 Number_of_Iterations: 1 Time_Per_Exposure: 30S Special_Requirements: SAME POS AS 10 NO SPLIT MIN DUR MAX DUR 40S Comments: Exposure_Number: 230 Target_Name: UZ-TAU Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F569W Wavelength: Optional_Parameters: ATD-GAIN=15 Number_of_Iterations: 1 Time_Per_Exposure: 30S Special_Requirements: SAME POS AS 10 NO SPLIT MIN DUR MAX DUR 40S Comments: Exposure_Number: 240 Target_Name: UZ-TAU Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F569W Wavelength: Optional_Parameters: ATD-GAIN=15 Number_of_Iterations: 1 Time_Per_Exposure: 30S Special_Requirements: SAME POS AS 10 NO SPLIT MIN DUR MAX DUR 40S Comments: Exposure_Number: 250 Target_Name: UZ-TAU Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F569W Wavelength: Optional_Parameters: ATD-GAIN=15 Number_of_Iterations: 1 Time_Per_Exposure: 30S Special_Requirements: SAME POS AS 10 NO SPLIT MIN DUR MAX DUR 40S Comments: Exposure_Number: 260 Target_Name: UZ-TAU Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F631N Wavelength: Optional_Parameters: ATD-GAIN=15 Number_of_Iterations: 1 Time_Per_Exposure: 300S Special_Requirements: SAME POS AS 10 NO SPLIT MIN DUR MAX DUR Comments: Exposure_Number: 270 Target_Name: UZ-TAU Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F631N Wavelength: Optional_Parameters: ATD-GAIN=15 Number_of_Iterations: 1 Time_Per_Exposure: 300S Special_Requirements: SAME POS AS 10 MAX DUR NO SPLIT MIN DUR Comments: Exposure_Number: 280 Target_Name: UZ-TAU Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F631N Wavelength: Optional_Parameters: CR-SPLIT=no,ATD-GAIN=15 Number_of_Iterations: 1 Time_Per_Exposure: 900S Special_Requirements: SAME POS AS 10 END ORBIT NO SPLIT MIN DUR MAX DUR 1200S Comments: Data_Distribution ! 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