J/ApJ/744/121 Far-UV spectroscopy of T Tau stars (Yang+, 2012)
A far-ultraviolet atlas of low-resolution Hubble Space Telescope spectra
of T Tauri stars.
Yang H., Herczeg G.J., Linsky J.L., Brown A., Johns-Krull C.M., Ingleby L.,
Calvet N., Bergin E., Valenti J.A.
<Astrophys. J., 744, 121 (2012)>
=2012ApJ...744..121Y 2012ApJ...744..121Y
ADC_Keywords: Stars, pre-main sequence ; Spectra, ultraviolet ; X-ray sources ;
Atlases ; Spectroscopy
Keywords: accretion, accretion disks - atlases - stars: pre-main sequence -
ultraviolet: stars
Abstract:
We present a far-ultraviolet (FUV) spectral atlas consisting of
spectra of 91 pre-main-sequence stars. Most stars in this sample were
observed with the Space Telescope Imaging Spectrograph and Advanced
Camera for Surveys on the Hubble Space Telescope (HST). A few archival
spectra from the International Ultraviolet Explorer and the Goddard
High Resolution Spectrograph on HST are included for completeness. We
find strong correlations among the OIλ1304 triplet, the SiIV
λλ1394/1403 doublet, the CIVλ1549 doublet, and
the HeII λ1640 line luminosities. For classical T Tauri stars
(CTTSs), we also find strong correlations between these lines and the
accretion luminosity, suggesting that these lines form in processes
related to accretion. These FUV line fluxes and X-ray luminosity
correlate loosely with large scatters. The FUV emission also
correlates well with Hα, Hβ, and CaII K line luminosities.
These correlations between FUV and optical diagnostics can be used to
obtain rough estimates of FUV line fluxes from optical observations.
Molecular hydrogen (H2) emission is generally present in the spectra
of actively accreting CTTSs but not the weak-lined T Tauri stars that
are not accreting. The presence of H2 emission in the spectrum of
HD 98800N suggests that the disk should be classified as actively
accreting rather than a debris disk.
Description:
We present an atlas of FUV spectra and emission line fluxes of all PMS
stars observed by HST -STIS (Space Telescope Imaging Spectrograph),
-GHRS (Goddard High Resolution Spectrograph), and -ACS (Advanced
Camera for Surveys). Most of the stars are members of the Taurus
Molecular Cloud. This atlas surveys the strength of FUV emission from
WTTSs (weak-lined T Tauri stars) and includes CTTSs with a wide range
of accretion rates and masses. Table 1 lists the 91 PMS stars in our
sample and information concerning their observations. The majority of
the observations were obtained with the STIS G140L grating (24 stars)
and ACS/SBC PR130L prism (54 stars) from 1986 Apr 24 to 2008 Nov 29.
For completeness, six stars that were observed with IUE (mainly from
Valenti et al. 2000ApJS..129..399V 2000ApJS..129..399V) but not with HST are included in
our sample.
We supplemented the HST/FUV observations with ground-based optical
spectra of many of the same targets, obtained with the Double
Spectrograph on the Hale 5m Telescope on Mount Palomar in 2008 January
and December (3200-8700Å range with R∼1000).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 108 98 Summary of observations for the 91 PMS star sample
table2.dat 106 91 Pre-main-sequence stars
table4.dat 132 95 Line flux measurements
refs.dat 85 36 References
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See also:
B/hst : HST Archived Exposures Catalog (STScI, 2007)
B/chandra : The Chandra Archive Log (CXC, 1999-2013)
V/73 : Emission-Line Stars of the Orion Population (Herbig+ 1988)
I/239 : The Hipparcos and Tycho Catalogues (ESA 1997)
J/MNRAS/421/78 : LMC PMS stars mass accretion rates (Spezzi+, 2012)
J/AJ/139/1338 : UV-selected stars in Tau and Upper Sco (Findeisen+, 2010)
J/A+A/519/A83 : T Tau stars toward the Taurus-Auriga region (Takita+ 2010)
J/A+A/468/353 : XMM-Newton Extended Survey of Taurus (Guedel+, 2007)
J/AJ/132/2665 : QUEST2 BRI photometry of Taurus-Auriga PMS (Slesnick+, 2006)
J/ApJS/159/141 : Spectroscopic properties of cool stars. I. (Valenti+, 2005)
J/ApJS/147/305 : IUE atlas of pre-main-sequence stars (Valenti+, 2003)
J/AJ/124/1670 : Post-T Tauri Stars in Sco-Cen Association (Mamajek+, 2002)
J/ApJ/581/1194 : Taurus-Auriga PMS stars ages and Teff (Palla+, 2002)
J/AJ/119/3026 : Circumstellar disk candidates in Orion (Rebull+, 2000)
J/A+AS/145/187 : uvby-β photometry of WTTS (Chavarria-K+, 2000)
J/AJ/117/354 : OB associations from Hipparcos (de Zeeuw+, 1999)
J/A+AS/132/173 : New weak-line T Tauri stars in Taurus-Auriga (Li+ 1998)
J/A+AS/124/449 : Young stars south of Taurus-Auriga (Magazzu+ 1997)
J/AJ/111/846 : Orion HST survey (O'Dell+ 1996)
J/A+A/312/439 : New T Tauri stars in Taurus-Auriga (Wichmann+, 1996)
J/ApJS/101/117 : UBVRIJHKLMNQ photometry in Taurus-Auriga (Kenyon+ 1995)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 --- Seq [1/91] Internal identification number for
cross-referencing
4- 6 I3 --- HBC [20/612]? HBC number from Herbig &
Bell (1988, Cat. V/73)
8- 20 A13 --- Name Star name
21 A1 --- f_Name [f] Abbreviated name (1)
23- 37 A15 --- OName Alternate name
38 A1 --- f_OName [f] Abbreviated OName (1)
40- 41 I2 h RAh Hour of right ascension (J2000)
43- 44 I2 min RAm Minute of right ascension (J2000)
46- 50 F5.2 s RAs Second of right ascension (J2000)
52 A1 --- DE- Sign of declination (J2000)
53- 54 I2 deg DEd Degree of declination (J2000)
56- 57 I2 arcmin DEm Arcminute of declination (J2000)
59- 62 F4.1 arcsec DEs Arcsecond of declination (J2000)
64- 73 A10 --- Inst Instrument: ACS PR130L, GHRS G160M,
IUE LWR-LO, IUE SWP-LO, STIS E140M, STIS G140L
75- 85 A11 "YYYY/MMM/DD" Date UT date of observation
87- 88 I2 --- N [1/18] Number of exposures
90- 97 F8.1 s Exp [630/151200] Exposure time
99-106 A8 --- PID HST and IUE program ID's
108 A1 --- f_PID [g] g: multiple program IDs: MR381, FSCJL
and UK353
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Note (1): Name abbreviations:
2M0414 = 2MASS J04141188+2811535;
2M0439 = 2MASS J04390163+2336029;
2M0444 = 2MASS J04442713+2512164;
2M0518 = 2MASS J05180285+2327127;
2M1111 = 2MASS J11114632-7620092;
2M1207A = 2MASS J12073347-3932540;
2M1614N = 2MASS J16141107-2305362 N;
2M1614S = 2MASS J16141107-2305362 S;
2M1842 = 2MASS J18425797-3532427;
2M1852 = 2MASS J18521730-3700119.
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Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 --- Seq [1/91] Running sequence number
4- 16 A13 --- Name Star name (1)
18- 27 A10 --- Reg Region
28 A1 --- f_Reg [I] I: Included in primary component
30- 34 F5.1 pc Dist [9.9/450]? Distance
36- 42 A7 --- SpT MK spectral type (F2 to M8) (2)
44- 48 A5 --- Type Category (WTTS or CTTS)
50- 54 F5.2 mag Av [-0.9/2.3]? Interstellar extinction
56- 61 F6.3 [Lsun] logLph [-2.72/1.79]? Log of photospheric luminosity
62 A1 --- f_logLph [r] r: redo
64- 68 F5.2 [Lsun] logLacc [-5.3/0.67]? Log of accretion luminosity
70- 74 F5.2 [10-7W] logLX [28.4/31.07]? Log of X-ray (0.3-10.0keV)
luminosity from literature, new Chandra and
Swift observations (in erg/s)
76- 78 A3 --- m_logLX Component sum
80- 87 F8.3 10-17W/m2 Hb [0.34/1567]? Hβ line flux
in 10-14erg/s/cm2
90- 97 F8.4 10-17W/m2 CaIIK [0.0128/521]? CaIIK line flux
in 10-14erg/s/cm2
99-106 A8 --- Ref Reference(s) (see refs.dat file)
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Note (1): For technical reason, "HBC 388" has been replaced by its name in
table 1, i.e. "V1072 Tau" and "HD 143006" by "V1149 Sco" at CDS.
Note (2): In parenthesis, "SB" stands for spectroscopic binary and "B"
stands for binary.
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Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 --- Seq [1/91] Running sequence number
4- 16 A13 --- Name Star name (1)
18- 27 A10 --- Inst Instrument (ACS, GHRS G160M, IUE or
STIS E140M, STIS G140L)
29- 34 F6.2 aW/m2 OI1304 ? OI 1304 line flux in 10-15erg/s/cm2
36- 40 F5.2 aW/m2 e_OI1304 ? OI1304 uncertainty
42- 47 F6.2 aW/m2 CII ? CII 1335 line flux in 10-15erg/s/cm2
49- 53 F5.2 aW/m2 e_CII ? CII uncertainty
55- 59 F5.2 aW/m2 OI1355 ? OI 1355 line flux in 10-15erg/s/cm2
61- 64 F4.2 aW/m2 e_OI1355 ? OI1355 uncertainty
66- 71 F6.2 aW/m2 Si13 ? SiIV 1394 line flux in
units of 10-15erg/s/cm2 (2)
73- 77 F5.2 aW/m2 e_Si13 ? Si13 uncertainty
79- 84 F6.2 aW/m2 Si14 ? SiIV 1403 line flux in units
of 10-15erg/s/cm2 (2)
85 A1 --- f_Si14 [-] -: Line not resolved (2)
87- 91 F5.2 aW/m2 e_Si14 ? Si14 uncertainty
93- 99 F7.2 aW/m2 CIV ? CIV 1549 line flux in 10-15erg/s/cm2
101-106 F6.2 aW/m2 e_CIV ? CIV uncertainty
108-114 F7.2 aW/m2 HeII ? HeII 1640 line flux in 10-15erg/s/cm2
116-120 F5.2 aW/m2 e_HeII ? HeII uncertainty
122-124 A3 --- H2? H2 emission?
126-132 E7.3 Lsun LFUV ? Extinction-corrected FUV luminosity between
1250 and 1700Å
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Note (1): For technical reason, "V1079 Tau" has been replaced by its name
in table 1, i.e. "LkCa 15" at CDS.
Note (2): A blank value indicates that the line is not apparent in the
spectrum, unless flagged. The "-" flag indicates that the SiIV 1403
line is not resolved and the flux in the SiIV 1394 column represents
the total flux of the doublet.
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Byte-by-byte Description of file: refs.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 --- Ref Reference code
4- 22 A19 --- BibCode Bibcode
24- 44 A21 --- Aut Author's name(s)
46- 85 A40 --- Comm Comment
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History:
From electronic version of the journal
(End) Emmanuelle Perret [CDS] 18-Jun-2013