J/A+A/562/A69 GSH 305+01-24 stellar content (Kaltcheva+, 2014)
Massive stellar content of the Galactic supershell GSH 305+01-24.
Kaltcheva N.T., Golev V.K., Moran K.
<Astron. Astrophys. 562, A69 (2014)>
=2014A&A...562A..69K 2014A&A...562A..69K
ADC_Keywords: Stars, OB ; Stars, distances
Keywords: open clusters and associations: individual:
Centaurus star-forming field -
ISM: individual objects: GSH 305+01-24 - stars: early type
Abstract:
The distribution of OB stars along with that of Hα, 12CO, dust
infrared emission, and neutral hydrogen is carried out in order to
provide a more complete picture of interactions of the young massive
stars and the observed supershell GSH 305+01-24.
The studied field is located between 299°≤ l≤ 311° and
-5°≤b≤7°. The investigation is based on nearly 700 O-B9
stars with uvbyβ photometry currently available. The derived
stellar physical parameters were used to establish a homogeneous scale
for the distances and extinction of light for major apparent groups
and layers of foreground and background stars in Centaurus and study
the interaction with the surrounding interstellar medium.
The distance to the entire Centaurus star-forming complex is revised
and a maximum of the OB-star distance distribution is found at
1.8±0.4 (r.m.s) kpc. The massive star component of GSH 305+01-24
is identified at about 85-90% completeness up to 11.5-12mag. The
projected coincidence of the OB stars with the shell and the
similarities between the shell's morphology and the OB-star
distribution indicate a strong interaction of the stellar winds with
the superbubble material. We demonstrate that these stars contribute a
sufficient wind injection energy in order to explain the observed size
and expansion velocity of the supershell. The derived stellar ages
suggest an age gradient over the Coalsack Loop. A continuous
star-formation might be taking place within the shell with the
youngest stars located at its periphery and the open cluster NGC 4755
being the oldest. A layer of very young stars at 1kpc is detected and
its connection to both GSH 305+01-24 and the foreground GSH 304-00-12
HI shells is investigated.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 151 693 *Photometric data and derived stellar parameters
for the full sample of young stars with
uvbyβ data in the field
table3.dat 151 40 *The photometric data and the derived stellar
parameters for young stars located around 1kpc
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Note on table1.dat: The star are ordered according to their galactic longitude.
Note on table3.dat: The star are ordered according to color excess E(b-y), with
reddened stars in the lower half, starting with HD 112661.
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See also:
II/215 : uvby-beta Catalogue (Hauck+ 1997)
Byte-by-byte Description of file: table1.dat table3.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- Name SIMBAD identifier
17- 25 I9 --- LID Lausanne IDentifier (II/215), uvby98 in SIMBAD
28- 36 F9.4 deg GLON Galactic longitude
37- 44 F8.4 deg GLAT Galactic latitude
45- 51 F7.3 mag Vmag V magnitude
52- 59 F8.3 mag b-y Stroemgren colour index b-y
60- 67 F8.3 mag m1 Stroemgren colour m1
68- 75 F8.3 mag c1 Stroemgren colour c1
76- 83 F8.3 mag beta Stroemgren index β
86- 97 A12 --- SpType MK spectral type as in SIMBAD
98-105 F8.3 mag (b-y)0 Dereddened b-y colour index
106-113 F8.3 mag c0 Dereddened c0 index
114-121 F8.3 mag m0 Dereddened m0 index
122-129 F8.3 mag E(b-y) b-y colour excess
130-137 F8.3 mag V0mag Dereddened V magnitude
138-144 F7.2 mag Vabs ?=99.99 Absolute V magnitude
145-151 F7.2 mag DM ?=99.99 Distance modulus
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Acknowledgements:
Valeri Golev, valgol(at)phys.uni-sofia.bg
(End) Patricia Vannier [CDS] 19-Dec-2013