J/PAZh/21/13 New list of OB associations (Melnik+, 1995)
New list of OB associations of our Galaxy.
Melnik A.M., Efremov Yu.N.
<Pis'ma Astron. Zh. 21, 13 (1995)>
=1995PAZh...21...13M 1995PAZh...21...13M
ADC_Keywords: Milky Way ; Associations, stellar ; Stars, OB ; Stars, early-type
Abstract:
A new partition into associations of OB stars within 3kpc of the Sun
is derived using Battinelli's modification of the cluster analysis
method. We have found 58 associations, of which only 10% may be
considered as a random clusters of field stars.
Description:
We identified 88 associations with at least 5 members which average
characteristics are shown in Table 1 of the paper by Mel'nik and
Efremov (1995PAZh...21...13M 1995PAZh...21...13M). The new table (list.dat) exhibits the
list of 1392 stars -- members of 88 associations of the new partition.
For each star we give its name, spectral type, V magnitude, galactic
coordinates l and b, distance from the Sun rBH. All these values are
taken from the catalog by Blaha and Humphreys (1989AJ..98...1598B)
which includes two parts: the catalog of young stars -- members of
associations or clusters and the catalog of field stars. The last two
columns exhibit the name of association to which the star is included
in the partition by Blaha and Humphreys (Assc_BH) and in the partition
by Mel'nik and Efremov (Assc_ME). The letter F in the last but one
column means that it is a field star in the catalog by Blaha and
Humphreys (1989AJ..98...1598B). There are some evidences that the
distance scale by Blaha and Humphreys (r_BH) should be shorten by
10-20% (Dambis et al. 2001AstL..27...58D; Mel'nik and Dambis 2009,
Cat. J/MNRAS/400/518).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table.dat 75 88 Table of OB-associations
list.dat 67 1392 List of stars -- members of OB associations of
the new partition
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Byte-by-byte Description of file: table.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- AssME Association name
11- 16 F6.2 deg GLON Galactic longitude
18- 23 F6.2 deg GLAT Galactic latitude
26- 29 F4.2 kpc D Distance
32- 36 F5.1 km/s RV ? Average radial velocity of the association
relative to the Sun
40- 43 F4.1 km/s e_RV ? Dispersion of RV
46- 47 I2 --- NRV Number of stars with measured RV
50- 52 I3 --- Ntot Total number of stars in the association
57- 61 F5.1 pc Dl Size of association along longitude
65- 68 F4.1 pc Db Size of association along latitude
71 I1 --- p [0/1] p=1 for the association with 90% reliability
p=0 for reliability below 90%
74- 75 I2 --- Nsg Number of K and M supergiants
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Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 14 A14 --- Name Designation of the star
16- 19 A4 --- SpType MK spectral type
21- 25 F5.2 mag Vmag Magnitude in V band
27- 32 F6.2 deg GLON Galactic longitude
34- 39 F6.2 deg GLAT Galactic latitude
42- 45 F4.2 kpc rBH Distance from the Sun derived by BH
48- 55 A8 --- AssBH Association of Blaha and Humphreys,
1989AJ..98...1598B
59- 67 A9 --- AssME Association of Mel'nik and Efremov, as
in table.dat file
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History:
* 25-Sep-1997: Original
* 06-Oct-2011: list.dat added, from Anna Mel'nik, anna(at)sai.msu.ru
(End) Veta Avedisova [INASAN] 10-Jul-1997