J/other/Ap/50.194 Groups of stars in NGC 1893 (Hovhannessian+, 2007)
Distribution of early-type stars and dusty matter in the direction of the
stellar cluster NGC 1893.
Hovhannessian R.K.
<Astrophysics, 50, 194-202 (2007)>
=2007Ap.....50..194H 2007Ap.....50..194H
ADC_Keywords: Associations, stellar ; Photometry
Keywords: stars: early type: dust - individual: NGC 1893
Abstract:
The distribution of 255 O-B9-A2, K-G stars and interstellar dust in
the direction of the stellar cluster NGC 1893 is studied using V, B-V,
and U-B photometric data. Sixteen groups of stars (associations) are
discovered at various distances.
The first group includes 9 stars of different spectral classes of
later types in the Sun's neighborhood lying at a distance of 110pc.
The next 3 groups, at distances of 420, 890, and 14300pc, are type B
associations and the remaining twelve groups are OB associations. They
are designated as Aur 0.11, Aur B 0.43, Aur B 0.89, Aur OB 1.4,
Aur OB 2.6, AurOB 3.8, Aur OB 4.6, Aur OB 5.4, Aur OB 6.1, Aur OB 7.4,
Aur OB 9.3, Aur OB11.6, Aur OB14.3, Aur OB 17.9, Aur OB 25.9, and
Aur OB 31.3. For most of these stars the absorption lies within the
range from 0.45m to 5.41m. Such high absorption may be caused by
circumstellar absorption as well as by the diffuse nebula IC 410. The
dusty matter is distributed non-uniformly in the Aur 0.11, Aur B 0.43,
and Aur B 0.89 associations. There is no dust in the space between the
associations. There is essentially no dust within the groups
(associations) at distances greater than 0.9kpc (see Table 2).
Objects:
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RA (2000) DE Designation(s)
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05 22.7 +33 25 NGC 1893 = C 0519+333
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 57 16 Groups of O-B-A3 Stars in the Direction of the
Cluster NGC 1893
table1.dat 43 255 Parameters of the Stars Studied
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See also:
J/MNRAS/379/1237 : NGC 1893 Halpha sources VIcJHK photometry (Maheswar+, 2007)
J/A+A/488/211 : Infrated photometry of NGC 1893 (Caramazza+, 2008)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- Group Group number, [H2007b] Group R in Simbad
6- 9 F4.2 mag E(B-V) Colour excess
11- 15 F5.2 mag MOD Distance modulus (V-MV)
17- 20 F4.2 mag AV Total absorption
22- 26 F5.2 mag MOD0 Distance modulus (V0-MV)
28- 31 F4.2 mag e_MOD0 rms uncertainty on MOD0
33- 37 I5 pc Dist Heliocentric distance
39- 42 I4 pc e_Dist rms uncertainty on Dist
44- 45 I2 --- Nstar Number of stars in the Group
47- 57 A11 --- Name Name of the Group
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- Group Group number, [H2007b] Group R in Simbad
6- 8 I3 --- Seq Sequential number, Cl* NGC 1893 H NNN in Simbad
10- 23 A14 --- SpType MK spectral type
26- 30 F5.3 mag E(B-V) Colour excess
33- 37 F5.2 mag MOD Distance modulus (V-MV)
40- 43 F4.2 mag AV Total absorption
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 24-Dec-2008