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J/A+A/297/391     T Tauri stars ROSAT survey (Neuhaeuser+, 1995)

ROSAT Survey observation of T Tauri stars in Taurus Neuhaeuser R., Sterzik M.F., Schmitt J.H.M.M., Wichmann R., Krautter J. <Astron. Astrophys. 297, 391 (1995)> =1995A&A...297..391N (SIMBAD/NED Reference)
ADC_Keywords: Stars, pre-main sequence ; X-ray sources Mission_Name: ROSAT Keywords: stars: formation - stars: late-type - stars: pre-main sequence - X-rays: stars Description: We study the X-ray emission of T Tauri stars (TTS) in Taurus-Auriga as observed with the spatially unbiased flux-limited ROSAT All-Sky Survey. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1 86 153 Sample of T Tauri stars (TTS) studied table2 91 56 ROSAT ALL Sky Survey (RASS) data for TTS above RASS detection limit table3 128 60 Spectral fit results for detected TTS table4 65 111 Upper limits for TTS below RASS limit table5 95 16 Statistical significance for correlations table6 113 19 Statistical significance for classical T Tauri stars (CTTS) and weak-line T Tauri stars (WTTS) being different tablea1 89 188 Non-X-ray data for TTS studied refs.dat 75 95 References quoted in table1 and tablea1
See also: V/73 : Emission-line stars in Orion population (Herbig+ 1988) J/A+A/312/439 : New T Tauri stars in Taurus-Auriga (Wichmann+, 1996) J/A+AS/132/173 : New weak-line T Tauri stars in Taurus-Auriga (Li+ 1998) Byte-by-byte Description of file: table1
Bytes Format Units Label Explanations
1- 19 A19 --- Name Name 20 A1 --- n_Name [abc] Note on name (1) 24- 26 I3 --- HBC []? HBC number V/73 (Herbig & Bell 1988) 28- 33 A6 --- Type Type of the star (2) 35- 44 A10 --- r_Name References (detailed in refs.dat) 49- 50 I2 h RAh Right ascension J2000.0 (optical position) 52- 53 I2 min RAm Right ascension J2000.0 (optical position) 55- 58 F4.1 s RAs Right ascension J2000.0 (optical position) 59 A1 --- DE- Declination sign 60- 61 I2 deg DEd Declination J2000.0 (optical position) 63- 64 I2 arcmin DEm Declination J2000.0 (optical position) 66- 69 F4.1 arcsec DEs Declination J2000.0 (optical position) 72- 75 A4 --- r_pm References regarding proper motion 78- 79 I2 --- r_RV []? References regarding radial velocity 81- 83 I3 --- RASS []? Maximum likelihood for existence for RASS detected objects 84 A1 --- u_RASS colon indicates source confusion 85- 86 A2 --- n_RASS 'ul' for RASS non-detections
Note (1): Multiple designations not mentioned elsewhere: (a) IRAS F04147+2822 (has stellar counterpart according to ref. 15) =Kim 3-76 (CTTS candidate according to ref. 14, WTTS according to ref. 10); (b) GN Tau (proper motion candidate, ref. 6) = Kim 1-35 (CTTS candidate, ref. 14) = IRAS F04362+2539 (CTTS, ref. 15; ref. 10 find GN Tau=IRAS04362+2539 to be a CTTS, too); (c) JH 223 (WTTS, ref. 13) = Kim 1-50 (CTTS candidate, ref. 14). Optical positions for Anon 1 is incorrect in ref. 1 and for NTTS 043230+1746 incorrect in both ref. 1 & 3, but correct in ref. 2 & ref. 27, respectively. Note (2): the types are: C : classical T Tauri stars W : weak T Tauri stars b : binaries t : triples q : quadruples t(wwc): triple system with two W and one C
Byte-by-byte Description of file: table2
Bytes Format Units Label Explanations
1- 20 A20 --- Name Name 23- 24 I2 h RAh Right ascension J2000.0 (X-ray position) 26- 27 I2 min RAm Right ascension J2000.0 (X-ray position) 29- 32 F4.1 s RAs Right ascension J2000.0 (X-ray position) 36 A1 --- DE- Declination sign 37- 38 I2 deg DEd Declination J2000.0 (X-ray position) 40- 41 I2 arcmin DEm Declination J2000.0 (X-ray position) 43- 46 F4.1 arcsec DEs Declination J2000.0 (X-ray position) 48- 51 F4.1 arcsec Dist Distance between X-ray and optical positions 52 A1 --- n_Dist [:] A colon indicates X-ray sources that appear to be extended 54- 57 F4.2 --- HR1 [-1/1] Hardness ratio 1 (1) 60- 63 F4.2 --- e_HR1 rms uncertainty on HR1 65- 69 F5.2 --- HR2 [-1/1] Hardness ratio 2 (1) 72- 75 F4.2 --- e_HR2 rms uncertainty on HR2 77- 81 F5.1 ct Xcount Background subtracted X-ray counts (for multiples and source confusion cases, we list the combined number of counts). 84- 87 F4.1 ct e_Xcount rms uncertainty on Xcount 89- 91 I3 s Exp RASS exposition time
Note (1): the hardness ratios are: HR1 = (Zh1+Zh2-Zs)/(Zh1+Zh2+Zs), HR2 = (Zh2-Zh1)/(Zh2+Zh1) where Zs, Zh1 and Zh2 denote count rates for the ROSAT PSPC energy bands soft (0.1 to 0.4 keV), hard 1 (0.5 to 0.9 keV) and hard 2 (0.9 to 2.0 keV), respectively.
Byte-by-byte Description of file: table3
Bytes Format Units Label Explanations
1- 20 A20 --- Name Name 22- 26 F5.2 [cm-2] logN(H) Foreground hydrogen column density 27 A1 --- u_logN(H) ':' indicates cases, where fixed absorption did not yield good fits (see text in Sec. 3 for details) 30- 33 F4.2 --- e(logN(H))u []? Error in absorption (upper interval) (1) 37- 40 F4.2 --- e(logN(H))l []? Error in absorption (lower interval) (1) 43- 46 F4.2 keV k.Tx X-ray emission energy 49- 52 F4.2 keV e(k.Tx)u Error in k.Tx (upper interval) 56- 59 F4.2 keV e(k.Tx)l Error in k.Tx (lower interval) 62- 66 F5.3 10+4J/ct/cm2 1/ECF Energy conversion factor (10-11/ECF) 69- 73 F5.3 10+4J/ct/cm2 e(1/ECF)u Error in ECF (upper interval) 77- 81 F5.3 10+4J/ct/cm2 e(1/ECF)l Error in ECF (lower interval) 84- 88 F5.3 10+23W Lx Individually corrected X-ray luminosity (Lx/10+30) (2) 92- 96 F5.3 10+23W e(Lx)u Error in Lx (upper interval) 100-104 F5.3 10+23W e(Lx)l Error in Lx (lower interval) 107-111 F5.3 10+4W/m2 Fs []? X-ray surface flux (Fs/10+7) (2) 115-119 F5.3 10+4W/m2 e(Fs)u []? Error in Fs (upper interval) 123-127 F5.3 10+4W/m2 e(Fs)l []? Error in Fs (lower interval)
Note (1): Foreground hydrogen column density which was either held fixed for the spectral fit, when given without errors, or, if used as free fit parameter, fit results with errors are given Note (2): For multiples we list X-ray luminosity and surface flux derived by the number of components known; c.f. Sec. 3 for more details
Byte-by-byte Description of file: table4
Bytes Format Units Label Explanations
1- 19 A19 --- Name Name (1) 21- 24 F4.1 arcsec Dist Offset of initial position 26- 31 F6.4 % Proba Probability of existence 33- 34 A2 --- l_Xcount [≤] limit flag on Xcount 35- 38 F4.1 ct Xcount Upper limit for the number of X-ray counts 40- 42 I3 s Exp Exposure time 44- 48 F5.3 10+4J/ct/cm2 1/ECF Energy conversion factor (10-11/ECF) (2) 49 A1 --- n_1/ECF [:] ':' average 1/ECF (2) 51- 52 A2 --- l_Lx [≤>] limit flag on Lx 53- 57 F5.3 10+23W Lx Upper limit for X-ray luminosity (Lx/10+30) 59- 60 A2 --- l_Fs [≤] limit flag on Fs 61- 65 F5.3 10+4W/m2 Fs []? Upper limit for X-ray surface flux (Fs/10+7)
Note (1): Components of multiple TTS are listed separately, if individually different value for absorption or radius are used (as for detected TTS, counts are not divided among components, but luminosities and fluxes are divided); c.f., Sec 3.4 for more details. Note (2): The energy conversion factor is, either calculated with individual visual extinction and average X-ray emission temperature for detected TTS or, if n_1/ECF = ':', the average ECF found for detected TTS is used
Byte-by-byte Description of file: table5
Bytes Format Units Label Explanations
1- 9 A9 --- Test Correlation tested 11 A1 --- n_Test [*] Note on Test (1) 13- 37 A25 --- Prop Test property 42- 49 A8 --- Unit Sample unit 52- 53 I2 --- det Number of pairs tested with detections 55- 56 I2 --- ul Upper limits detection 58- 63 F6.4 % PrCox Probability for the null hypothesis that the correlation tested is not present according to Cox's proportional hazard model 66- 71 F6.4 % PrKen Probability for the null hypothesis that the correlation tested is not present according to the Generalized Kendall's τ test 75- 80 F6.4 % PrSpe Probability for the null hypothesis that the correlation tested is not present according to the Spearman's ρ test 84- 89 F6.3 --- Slope []? Slope resulting from a linear regression for correlations accepted 91- 95 F5.3 --- e_Slope []? rms uncertainty on Slope
Note (1): When '*', tested here are correlations between degree of saturation defined as ratio of observed over saturated X-ray luminosity and both Wλ(Hα) and age, c.f., Sec. 4.3.
Byte-by-byte Description of file: table6
Bytes Format Units Label Explanations
1- 9 A9 --- Test Test item property 10 A1 --- n_Test Note on Test (1) 14- 21 A8 --- unit Test item unit 23- 24 I2 --- CTTSs Classical T Tauri stars (CTTS) sample size 28- 29 I2 --- CTTSsul []? Upper limits of the CTTS sample size 31- 38 F8.3 --- CTTSmn CTTS mean 42- 47 F6.3 --- e_CTTSmn rms uncertainty on CTTS mean 49- 56 F8.3 --- CTTSmd []? CTTS median 58- 59 I2 --- WTTSs Weak-line T Tauri stars (WTTS) sample size 63- 64 I2 --- WTTSsul []? Upper limits of the WTTS sample size 66- 73 F8.3 --- WTTSmn WTTS mean 77- 82 F6.3 --- e_WTTSmn rms uncertainty on WTTS mean 84- 91 F8.3 --- WTTSmd WTTS median 93- 98 F6.4 % PrGWpe Probability for the null hypothesis that CTTS and WTTS distributions are similar according to Gehan's generalized Wilcoxon test for permutation variance 100-105 F6.4 % PrGWhy Probability for the null hypothesis that CTTS and WTTS distributions are similar according to Gehan's generalized Wilcoxon test for hypergeometric variance 108-113 F6.4 --- PrLogRank Probability for the null hypothesis that CTTS and WTTS distributions are similar according to the logrank test (c.f. Sec. 5.1.)
Note (1): No median can be calculated for HR 1 for CTTS, because all data points are in one bin. Two-sample tests for HR 1 have been performed for all TTS (a) as well as for a co-eval sample of TTS (i.e., all TTS that are not know to be older than the oldest detected CTTS, according to new tracks) (b). Two-sample tests for LX have been performed for all TTS including detections and upper limits (c), just detected TTS (d), all TTS not originally discovered by X-rays including upper limits (e) and without upper limits (f), as well as for all TTS that are not older than the oldest CTTS including upper limits (g) and without upper limits (h).
Byte-by-byte Description of file: tablea1
Bytes Format Units Label Explanations
1- 17 A17 --- Name Name 19- 26 A8 0.1nm EWHa Halpha equivalent width 27- 31 A5 --- r_EWHa Reference for Halpha equivalent width 33 A1 --- l_vsini limit flag on vsini 34- 36 I3 km/s vsini []? Projected surface velocity 37- 40 F4.1 d P []? Rotation period 42- 46 A5 --- r_P References for P and vsini (1) 48- 52 F5.2 solLum L []? Stellar bolometric luminosity 54- 55 I2 --- r_L []? References for the luminosity L 57- 59 F3.1 solMass Mass []? Stellar mass 60 A1 --- u_Mass uncertainty flag on M 62- 63 I2 --- r_Mass []? References for the mass M 64 A1 --- l_log(t) limit flag on age 65- 67 F3.1 [yr] log(t) []? Stellar age 68 A1 --- u_log(t) uncertainty flag on age 70- 71 I2 --- r_log(t) []? References for the age t 73- 77 F5.3 [K] log(Teff) []? Effective temperature 79- 80 I2 --- r_log(Teff) []? References for Teff 82- 86 F5.2 mag Av []? Visual extinction 88- 89 I2 --- r_Av []? References for the extinction Av
Note (1): (*) rotation data according to ref. 48, 51, 52, & 88; (**) rotation data according to ref. 74 to 77 & 89.
Table 7: Detection rates ±------------------------------------------+ | Object class | sample | detected | % | | | size | object | | ±------------------------------------------+ |(1) all TTS | 153 | 57 | 37 | |(2) all CTTS | 79 | 9 | 11 | |(3) all WTTS | 65 | 43 | 66 | |(4) Single CTTS | 53 | 3 | 6 | |(5) Single WTTS | 38 | 21 | 50 | |(6) Binary CTTS | 20 | 2 | 10 | |(7) Binary WTTS | 23 | 19 | 83 | |(8) Triple TTS | 6 | 5 | 83 | |(9) Quadruple TTS | 5 | 3 | 60 | ±------------------------------------------+ Byte-by-byte Description of file: refs.dat
Bytes Format Units Label Explanations
2- 3 I2 --- RefNum Reference number 6- 75 A70 --- Text Text of reference, including the bibcode
References: See file refs.dat
(End) Patricia Bauer [CDS] 16-Nov-1994, rev. 26-Aug.1996
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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