J/A+A/543/A101 OB stars in Cygnus OB2 association (Comeron+, 2012)
New members of the massive stellar populations in Cygnus.
Comeron F., Pasquali A.
<Astron. Astrophys. 543, A101 (2012)>
=2012A&A...543A.101C 2012A&A...543A.101C
ADC_Keywords: Associations, stellar ; Stars, O ; Stars, B-type ;
MK spectral classification
Keywords: stars: early-type - stars: formation -
open clusters and associations: Cygnus OB2 -
open clusters and associations: Cygnus OB9 -
ISM: individual objects: Cygnus X
Abstract:
The Cygnus OB2 association and its surroundings display the richest
collection of massive stars in our nearby Galactic environment and a
wealth of signposts of the interaction between these stars and the
interstellar gas.
We perform a magnitude-limited, homogeneous census of O and early
B-type stars with accurate spectral classifications in the blue, in a
6°x4° region centered on Cygnus OB2 that includes most of the
Cygnus X complex, a sizeable fraction of the adjacent Cygnus OB9
association, and a large area of the field surrounding these complexes
Description:
By using reddening-free indices based on BJHK magnitudes from the
USNO-B and 2MASS catalogs, we are able to produce a highly complete,
highly uncontaminated sample of O and early B stars, which nearly
duplicates any previous census of the region for the same range of
spectral types. We provide the spectral types of 60 new O and B stars,
as well as a list of an additional 60 candidates pending spectroscopic
confirmation. In addition, the UBV imaging of the surroundings of
three apparently isolated Ostars is used to investigate the possible
presence of small clusters of young stars around them.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 88 119 Known, spectroscopically classified O and B stars
in the region
table2.dat 40 17 Stars with previous classification reobserved by us
table3.dat 88 60 New O and B stars
table4.dat 88 61 Other candidate O and B stars without spectral
classification
table5.dat 88 20 Later-type stars
table6.dat 38 10 O and B stars from Massey & Thompson (1991,
Cat. J/AJ/101/1408) not selected by our criterion
table7.dat 71 179 Physical parameters of spectroscopically
classified O and B stars, assuming DM=10.8
refs.dat 64 17 References
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See also:
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
V/69 : MK, UBV Time and Latitude Stars (Sato+ 1990)
J/AJ/101/1408 : Massive stars in Cyg OB2. (Massey+ 1991)
J/ApJS/158/193 : Catalog of Galactic β Cephei stars (Stankov+, 2005)
J/A+A/486/453 : NIR photometry of early-type stars in Cyg OB2 (Comeron+, 2008)
J/ApJ/664/1102 : Radial velocity survey of Cyg OB2 association (Kiminki+, 2007)
Byte-by-byte Description of file: table1.dat table3.dat table4.dat table5.dat
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Bytes Format Units Label Explanations
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1- 18 A18 --- Name Object name (1)
20- 21 I2 h RAh Right ascension (J2000)
23- 24 I2 min RAm Right ascension (J2000)
26- 31 F6.3 s RAs Right ascension (J2000)
33 A1 --- DE- Declination sign (J2000)
34- 35 I2 deg DEd Declination (J2000)
37- 38 I2 arcmin DEm Declination (J2000)
40- 44 F5.2 arcsec DEs Declination (J2000)
46- 51 F6.3 mag Bmag USNO-B1.0 B magnitude
53- 57 F5.3 mag Jmag 2MASS J magnitude
59- 63 F5.3 mag Hmag 2MASS H magnitude
65- 69 F5.3 mag Ksmag 2MASS Ks magnitude
71- 83 A13 --- SpType MK spectral type (only in table1)
85- 86 I2 --- r_SpType ? Reference for spectral type,
in refs.dat file
88 A1 --- n_Name Individual note (2)
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Note (1): JHHMMSSss+DDMMsss for 2MASS sources.
Note (2): Individual notes as follows:
a = Variable (Petrie et al., 1973PDAO...14..151P 1973PDAO...14..151P)
b = Eclipsing binary
c = β Cep variable (Stankov & Handler, 2005, Cat. J/ApJS/158/193)
d = Binary
e = Eclipsing binary (Kiminki et al., 2007, Cat. J/ApJ/664/1102)
f = Runaway with bow shock (Comeron & Pasquali 2007ApJ...664.1102K 2007ApJ...664.1102K)
g = V1393 Cyg
h = Binary (Kiminki et al., 2009AJ....137.4608K 2009AJ....137.4608K)
i = Runaway with bow shock (Kobulnicki et al., 2010ApJ...710..549K 2010ApJ...710..549K)
j = fi Cep variable (Stankov & Handler, 2005, Cat. J/ApJS/158/193)
k = Classified as B5 in the HDE catalog
l = Classification as B2 in the HDE catalog
m = Candidate early-type star in Comeron et al.,2008, Cat. J/A+A/486/453 )
n = Classified as early-type star in Comeron et al. (1998A&A...330..975C 1998A&A...330..975C)
(star B18)
o = Binary
p = Classical Cepheid (Klagyivik & Szabados, 2009, Cat. J/A+A/504, 959)
q = A-type (this work)
r = F5-type close binary (Douglass et al., 2000, Cat. J/AJ/119/3071)
s = M8e Mira variable (Cameron & Nassau, 1956ApJ...124..346C 1956ApJ...124..346C)
t = Late type (this work)
u = possible misidentification between USNO-B and 2MASS due to high
proper motion
v = flare star (Pettersen et al., 1988Afz....29...67P 1988Afz....29...67P)
w = M8 (Vogt 1973)
x = R:, infrared bipolar nebula (Kraemer et al., 2010AJ....139.2319K 2010AJ....139.2319K)
y =: A2 (based on Vilnius photometry)
z =: A0 (based on Vilnius photometry)
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 17 A17 --- Name Name
19- 30 A12 --- SpTypep Published MK classification
32- 40 A9 --- SpType Our MK classification
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- [MT91] Identification number in Massey & Thompson
(1991, Cat. J/AJ/101/1408)
5- 6 I2 h RAh Right ascension (J2000)
8- 9 I2 min RAm Right ascension (J2000)
11- 15 F5.2 s RAs Right ascension (J2000)
17 A1 --- DE- Declination sign (J2000)
18- 19 I2 deg DEd Declination (J2000)
21- 22 I2 arcmin DEm Declination (J2000)
24- 27 F4.1 arcsec DEs Declination (J2000)
29- 38 A10 --- SpType MK spectral type
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Byte-by-byte Description of file: table7.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Field Field (Cygnus OB2, Cygnus OB9 or Field)
12 A1 --- st [KN] Status: Known or New star
14- 31 A18 --- Name Object name
32- 44 A13 --- SpType MK spectral type
46- 49 F4.1 mag AV Absorption in V band
51- 55 I5 K Teff Effective temperature
57- 61 F5.2 mag VMAG Absolute V magnitude
63- 66 F4.1 Msun Mass Mass
68- 71 F4.1 Myr Age Age
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Ref Reference number
4- 22 A19 --- BibCode BibCode
24- 44 A21 --- Aut Author's name
46- 64 A19 --- Com Comments
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Acknowledgements:
Fernando Comeron, fcomeron(at)eso.org
History:
* 22-May-2012: Original version
* 06-Oct-2012: removed duplicated record in table7: J20331748+4117093
* 16-Oct-2012: added 2MASS J20332557+4133269 in table7
(End) Patricia Vannier [CDS] 22-May-2012