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 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:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 93 357 Hα Emission-Line Stars in NGC 2264
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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
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Bytes Format Units Label Explanations
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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 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
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Note (1): Newly discovered stars only.
Note (2): LHa numbers 1-84 are defined in Herbig (1954ApJ...119..483H 1954ApJ...119..483H),
and LkHa 360-370 in Marcy (1980AJ.....85..230M 1980AJ.....85..230M)
Em* LkHA NNN in Simbad.
Note (3): Defined in Ogura (1984PASJ...36..139O 1984PASJ...36..139O), except for 136, which
is from Walsh et al. (1992MNRAS.257..110W 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.
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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