J/AJ/118/2409 VRI photometry of λ Ori PMS stars (Dolan+, 1999)
A WIYN lithium survey for young stars in the λ Orionis
star-forming region.
Dolan C.J., Mathieu R.D.
<Astron. J. 118, 2409 (1999)>
=1999AJ....118.2409D 1999AJ....118.2409D
ADC_Keywords: Stars, pre-main sequence ; Photometry, VRI ; Photometry, CCD
Keywords: stars: formation - stars: pre-main-sequence
Description:
We have found 72 premain-sequence (PMS) stars near the center of the
λ Orionis star-forming region by spectroscopically testing a
magnitude-limited sample for the presence of lithium λ6708
absorption, a diagnostic of youth. All of these stars show large
lithium equivalent widths and radial velocities consistent with Orion
membership, but only two were discovered previously via Hα or
X-ray surveys.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 75 75 Pre-main-sequence stellar data
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See also:
J/AJ/121/2124 : Paper II (Dolan+, 2001)
I/252 : The USNO-A2.0 Catalogue (Monet+ 1998)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- [DM99] [1/72] The λ Ori running number
3 A1 --- n_[DM99] [aef] Individual note (1)
5- 10 I6 --- USNO USNO number (2)
12- 13 I2 h RAh Right Ascension from USNO-A 2.0 catalog (J2000)
15- 16 I2 min RAm Right Ascension from USNO-A 2.0 catalog (J2000)
18- 22 F5.2 s RAs Right Ascension from USNO-A 2.0 catalog (J2000)
24 A1 --- DE- Declination sign (J2000)
25- 26 I2 deg DEd Declination from USNO-A 2.0 catalog (J2000)
28- 29 I2 arcmin DEm Declination from USNO-A 2.0 catalog (J2000)
31- 35 F5.2 arcsec DEs Declination from USNO-A 2.0 catalog (J2000)
37- 41 F5.2 mag Vmag The V band magnitude
43- 46 F4.2 mag V-R The (V-R) color
48- 51 F4.2 mag R-I The (R-I) color
54- 57 F4.2 0.1nm EWLi ? Equivalent width of Li (3)
58 A1 --- n_EWLi [c] Note on EWLi (4)
60- 64 F5.2 0.1nm EWHa ? Equivalent width of Hα (5)
65 A1 --- n_EWHa [c] Note on EWHa
67- 72 F6.2 km/s RVel Stellar radial velocity
73 A1 --- n_RVel [d] Flag on RVel (6)
75 I1 --- Nobs ? Number of observations
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Note (1): a: Two entries for this star (double-lined spectrum)
e: [DM99] 6 = DIL 52, f: [DM99] 36 = DIL 54
Note (2): From the USNO-A1.0 catalog (Monet et al., 1996, See Cat. I/252,
USNO-A2.0). Each name is in the format 0975-01
Note (3): Positive values indicate absorption
Note (4): c: Wλ measured from the combined light of both components
Note (5): Positive values indicate emission
Note (6): d: Double-lined spectrum
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History:
From electronic version of the journal
(End) Patricia Bauer [CDS] 21-Sep-2001