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J/AJ/127/1117       Halpha emission-line stars in NGC2264    (Reipurth+, 2004)

Hα emission-line stars in molecular clouds. I. The NGC 2264 region. Reipurth B., Pettersson B., Armond T., Bally J., Vaz L.P.R. <Astron. J., 127, 1117-1130 (2004)> =2004AJ....127.1117R
ADC_Keywords: Molecular clouds ; Stars, pre-main sequence ; Stars, Be ; Photometry, infrared Keywords: stars: emission-line, Be - stars: formation - stars: pre-main-sequence Abstract: We present a deep survey of Hα emission-line stars in the NGC 2264 region using wide-field objective prism films. We find 357 Hα emission-line stars, of which 113 were previously detected, within an area of 3°x3° centered on the Cone Nebula, with a majority of stars being concentrated in a dense cluster at the center of the region. We present a large-scale CO map of NGC 2264 and find a strong correlation between the cluster of Hα emission-line stars and the most massive core in the cloud complex. A more extended halo of stars poorly correlated with the gas may represent stars that have drifted away from their birth place, suggesting that star formation has taken place in NGC 2264 for several million years. Description: The spectral films were taken at the ESO 100/152cm Schmidt telescope at the European Southern Observatory at La Silla. The CCD images of NGC 2264 used here were obtained on 2000 January 10-12 at the 0.9m reflector located on Kitt Peak About 30,000 spectra of the 110GHz J=1->0 13CO line were obtained on a regular 1' grid between 1991 January and April with the AT&T Bell Laboratories 7m offset Cassegrain antenna located in Holmdel, New Jersey. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 93 357 Hα Emission-Line Stars in NGC 2264
See also: II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) I/284 : The USNO-B1.0 Catalog (Monet+ 2003) J/AJ/127/2659 : NGC 2264 Chandra observations (Ramirez+, 2004) J/AJ/123/1528 : UBV(RI)C and JHK photometry in NGC 2264 (Rebull+, 2002) J/A+A/355/651 : HRI observations of PMS stars in NGC 2264 (Flaccomio+, 2000) J/A+A/345/521 : BVRI photometry of NGC 2264 (Flaccomio+, 1999) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 3 I3 --- ESO-HA ? ESOHα identification number (1) 5- 7 I3 --- LkHa ? LHα identification number, Em* LkHA NNN in Simbad (2) 9- 11 I3 --- KHA ? KHα identification number (3) 13- 15 I3 --- NGC2264 ? Walker (1956ApJS....2..365W) identification number, NGC 2264 NNN in Simbad 16 A1 --- m_NGC2264 Multiplicity index on NGC2264 18- 21 A4 --- RMS ? Rebull et al. (2001, Cat. J/AJ/123/1528) number, Cl* NGC 2264 RMS NNNN 23- 24 I2 h RAh Hour of right ascension (J2000) (4) 26- 27 I2 min RAm Minute of right ascension (J2000) (4) 29- 32 F4.1 s RAs Second of right ascension (J2000) (4) 34 A1 --- DE- Sign of the declination (J2000) (4) 35- 36 I2 deg DEd Degree of declination (J2000) (4) 38- 39 I2 arcmin DEm Arcminute of declination (J2000) (4) 41- 42 I2 arcsec DEs Arcsecond of declination (J2000) (4) 44- 46 A3 --- Ha Hα line strength (5) 48- 52 F5.2 mag Bmag ? USNO-B catalog blue (IIIa-J emulsion) photographic magnitude 53 A1 --- f_Bmag [*] Indicates data extracted from GSC 2.2 55- 59 F5.2 mag Rmag ? USNO-B catalog red (IIIaF emulsion) photographic magnitude 60 A1 --- f_Rmag [*] Indicates data extracted from GSC 2.2 62- 66 F5.2 mag Nmag ? USNO-B catalog far-red (IV-N emulsion) photographic magnitude 68- 72 F5.2 mag Jmag ? 2MASS J-band magnitude 74 A1 --- f_Jmag [u] Indicates an upper value 76- 80 F5.2 mag Hmag ? 2MASS H-band magnitude 82 A1 --- f_Hmag [u] Indicates an upper value 84- 88 F5.2 mag Ksmag ? 2MASS Ks band magnitude 90 A1 --- f_Ksmag [u] Indicates an upper value
Note (1): Newly discovered stars only. Note (2): LHa numbers 1-84 are defined in Herbig (1954ApJ...119..483H), and LkHa 360-370 in Marcy (1980AJ.....85..230M) Em* LkHA NNN in Simbad. Note (3): Defined in Ogura (1984PASJ...36..139O), except for 136, which is from Walsh et al. (1992MNRAS.257..110W). KHA NNN in Simbad Note (4): The positions are extracted from the 2MASS All-Sky Catalog (II/246) and are accurate to ∼0.1 arcsec. Note (5): The Hα strength is defined so that 1 is weak emission against a strong continuum and 5 is strong emission against a weak continuum. Emission-line strengths were estimated on each film separately and differences in estimates are indicated as hyphenated values, e.g., 3-4. Such differences were, with a few exceptions, not major and may represent either variability and/or uncertainty in the estimate.
History: * 02-Jul-2004: From electronic version of the journal * 23-Feb-2006: One sequential number corrected (533 instead of 033) in table2
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 02-Jul-2004
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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