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J/AJ/131/2959     Candidate low-mass PMS in 25 Orionis group    (McGehee+, 2006)

The southern flanking fields of the 25 Orionis group. McGehee P.M. <Astron. J., 131, 2959-2966 (2006)> =2006AJ....131.2959M
ADC_Keywords: Associations, stellar ; Stars, pre-main sequence ; Stars, late-type ; Photometry, SDSS Keywords: open clusters and associations: individual (25 Orionis) - stars: formation - stars: late-type - stars: low-mass, brown dwarfs - stars: pre-main sequence Abstract: The stellar group surrounding the Be (B1Vpe) star 25 Ori was discovered to be a pre-main-sequence (PMS) population by the CIDA Variability Survey of Orion (Cat. J/AJ/129/907) and subsequent spectroscopy. We analyze Sloan Digital Sky Survey multiepoch photometry to map the southern extent of the 25 Ori group and characterize its PMS population. We compare this group to the neighboring Orion OB1a and OB1b subassociations and to active star formation sites (NGC 2068/NGC 2071) within the LDN 1630 dark cloud. We find that the 25 Ori group has a radius of 1.4°, corresponding to 8-11pc at the distances of Orion OB1a and OB1b. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 71 506 Candidate low-mass PMS in the Orion equatorial region
See also: J/AJ/129/907 : New Ori OB1 members (Briceno+, 2005) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 4 A4 --- --- [SDSS] 6- 24 A19 --- SDSS Source name ([M2006] SDSS JHHMMSS.ss+DDMMSS.s in Simbad) from SDSS low Galactic latitude (see Finkbeiner et al., 2004AJ....128.2577F) 26- 32 F7.4 deg RAdeg Right Ascension in decimal degrees (J2000) 34- 40 F7.4 deg DEdeg Declination in decimal degrees (J2000) 42- 46 F5.2 mag gmag SDSS g band magnitude 48- 52 F5.2 mag rmag SDSS r band magnitude 54- 58 F5.2 mag imag SDSS i band magnitude 60- 64 F5.2 mag zmag SDSS z band magnitude 66- 69 F4.2 deg R Distance from the Be star 25 Ori 71 A1 --- TTS [CW] Weak-lined (W) or Classical (C) T Tauris (1)
Note (1): Based on multi-band variability.
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 07-Jul-2008
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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