AS 314

AS 314, also known as V452 Scuti, is a white hypergiant star and luminous blue variable candidate located in the constellation of Scutum. It has an apparent magnitude of 9.85 and can be seen with small telescopes.

V452 Scuti
Observation data
Epoch J2000      Equinox J2000
Constellation Scutum
Right ascension 18h 39m 26.10612s[1]
Declination −13° 50′ 47.1892″[1]
Apparent magnitude (V) 9.85[2]
Characteristics
Spectral type A0Ia+[3]
U−B color index +0.12[2]
B−V color index +0.89[2]
Variable type cLBV[4]
Astrometry
Radial velocity (Rv)−50.00[3] km/s
Proper motion (μ) RA: 1.87[1] mas/yr
Dec.: -9.55[1] mas/yr
Parallax (π)4,29 ± 1.68[1] mas
Distance8,000[5] pc
Absolute magnitude (MV)−8.0[3]
Details
Luminosity79,400[5] L☉
Temperature10,200[5] K
Other designations
V452 Sct, BD -13°5061, HIP 91477, 2MASS J18392610-1350470
Database references
SIMBADdata

Characteristics

AS 314 was poorly studied until the year 2000, when Miroshnichenko et al. determined a distance for this star of around 10 kiloparsecs (32,600 light years), a luminosity 160,000 times that of Sun (L☉), a radius 200 times the solar radius (R☉), and an initial mass of 20 solar masses (M☉). It's losing 2 × 10−5 M☉ each year (in other words, 1 M☉ every 50,000 years) through a very strong stellar wind.[3]

It has an infrared excess, suggesting that it's shrouded in a circumstellar envelope of dust, which perhaps produced outbursts in the past as a luminous blue variable, because its location in the Hertzsprung–Russell diagram places it near the zone occupied by those stars;[3][6] however, it has not been classified as a bona fide luminous blue variable, but as a candidate.[4]

The Hipparcos parallax and proper motions are large and imply a much closer, and hence less luminous, star.[1]

References
  1. Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600.
  2. Kozok, J. R. (1985). "Photometric observations of emission B-stars in the southern Milky Way". Astronomy and Astrophysics Supplement Series. 61: 387. Bibcode:1985A&AS...61..387K.
  3. Miroshnichenko, A. S.; Chentsov, E. L.; Klochkova, V. G. (2000). "AS?314: A dusty A?type hypergiant" (PDF). Astronomy and Astrophysics Supplement Series. 144 (3): 379. Bibcode:2000A&AS..144..379M. doi:10.1051/aas:2000216.
  4. Nazé, Y.; Rauw, G.; Hutsemékers, D. (2012). "The first X-ray survey of Galactic luminous blue variables". Astronomy & Astrophysics. 538: A47. arXiv:1111.6375. Bibcode:2012A&A...538A..47N. doi:10.1051/0004-6361/201118040. S2CID 43688343.
  5. van Genderen, A.M. (2001). "S Doradus variables in the Galaxy and the Magellanic Clouds". Astronomy & Astrophysics. 366 (2): 508–531. Bibcode:2001A&A...366..508V. doi:10.1051/0004-6361:20000022.
  6. Clark, J. S.; Larionov, V. M.; Arkharov, A. (May 2005). "On the population of galactic Luminous Blue Variables" (PDF). Astronomy and Astrophysics. 435 (1): 239–246. Bibcode:2005A&A...435..239C. doi:10.1051/0004-6361:20042563.
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