J/ApJ/671/781 Red supergiants in Sct-Cru Galactic arm (Davies+, 2007)
A massive cluster of red supergiants at the base of the Scutum-Crux arm.
Davies B., Figer D.F., Kudritzki R.-P., Mackenty J., Najarro F., Herrero A.
<Astrophys. J., 671, 781-801 (2007)>
=2007ApJ...671..781D 2007ApJ...671..781D
ADC_Keywords: Clusters, open ; Stars, supergiant ; Photometry, infrared
Keywords: open clusters and associations: general - stars: evolution -
stars: late-type - supergiants
Abstract:
We report on the unprecedented red supergiant (RSG) population of a
massive young cluster, located at the base of the Scutum-Crux Galactic
arm. We identify candidate cluster RSGs based on 2MASS photometry and
medium-resolution spectroscopy. With follow-up high-resolution
spectroscopy, we use CO band-head equivalent width and high-precision
radial velocity measurements to identify a core grouping of 26
physically associated RSGs-the largest such cluster known to date.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 75 73 Observational data for the brightest stars in the
2MASS-PSC within 7' of the cluster center
table2.dat 62 26 Derived data of the cluster stars
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See also:
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Seq Sequential number (1)
3 A1 --- n_Seq Multiplicity index on Seq (1)
5- 6 I2 --- [S90] ? Stephenson (1990AJ.....99.1867S 1990AJ.....99.1867S) number
8- 11 I4 --- N01 ? Nakaya et al. (2001AJ....122..876N 2001AJ....122..876N) number
13- 14 I2 h RAh Right ascension (J2000.0)
16- 17 I2 min RAm Right ascension (J2000.0)
19- 22 F4.1 s RAs Right ascension (J2000.0)
24 A1 --- DE- Declination sign (J2000.0)
25- 26 I2 deg DEd Declination (J2000.0)
28- 29 I2 arcmin DEm Declination (J2000.0)
31- 34 F4.1 arcsec DEs Declination (J2000.0)
36- 41 F6.3 mag Jmag ? 2MASS J magnitude
43- 47 F5.3 mag Hmag ? 2MASS H magnitude
49- 53 F5.3 mag Ksmag ? 2MASS Ks magnitude
55- 64 A10 "YYYY/MM/DD" Date1 NIRSPEC observation date
66- 75 A10 "YYYY/MM/DD" Date2 IRMOS observation date
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Note (1): Stars identified as <Cl* Stephenson 2 DFK NNa> in Simbad.
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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- 2 I2 --- Seq Sequential number, as in table1
4- 8 F5.1 km/s Vlsr LSR velocity
10- 13 I4 K Teff Effective temperature
15- 17 I3 K e_Teff rms uncertainty on Teff
19- 20 A2 --- SpType MK spectral type
22- 25 F4.2 mag AKs Absorption in Ks band
27- 30 F4.2 mag e_AKs rms uncertainty on AKs
32- 37 F6.2 mag KMAG Absolute K magnitude
39- 42 F4.2 mag E_KMAG Error on KMAG (upper value)
44- 47 F4.2 mag e_KMAG Error on KMAG (lower value)
49- 52 F4.2 [solLum] logLbol Bolometric luminosity
54- 57 F4.2 [solLum] E_logLbol Error on Lbol (upper value)
59- 62 F4.2 [solLum] e_logLbol Error on Lbol (lower value)
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 14-Mar-2010