HR 4049

HR 4049
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Antlia
Right ascension 10h 18m 07.59s[1]
Declination –28° 59 31.2[1]
Apparent magnitude (V) 5.53
Characteristics
Spectral type B9.5Ib-II
B−V color index 0.23
Variable type Post-AGB Star
Astrometry
Radial velocity (Rv)-33 km/s
Proper motion (μ) RA: –15.86 ± 0.32[1] mas/yr
Dec.: 10.85 ± 0.38[1] mas/yr
Parallax (π)1.23 ± 0.36[1] mas
Distanceapprox. 2,700 ly
(approx. 800 pc)
Absolute magnitude (MV)-3.68
Details
Mass1.2 M
Radius15.1 [2] R
Luminosity3823 L
Temperature11500 K
Other designations
AG Antliae, CD-28° 8070, 2MASS J10180758-2859308, GSC 06630-01759, HD 89353, FK5 1265, PPM 257470, HIP 50456, SAO 178644, HR 4049.
Database references
SIMBADdata

HR 4049, also known as HD 89353 and AG Antliae, is a post-asymptotic-giant-branch star in the constellation Antlia. A very metal-poor star,[3] it is surrounded by a thick unique circumbinary disk enriched in several molecules.[4] With an apparent magnitude of 5.53, the star can readily be seen under ideal conditions.[5] The star, located approximately 813 parsecs (2,650 ly) distant,[5] has been found to be a binary star;[6] however, likely the most unique feature about this star is its peculiar spectrum. The star appears, based on its spectrum in the Balmer series, to be a blue supergiant, although in reality it is an old low-mass star on the post-AGP phase of its life.[7] The star is also undergoing intense mass-loss[8] and is a unique variable, ranging between magnitudes 5.29 and 5.83 with a period of 429 days[9]

References

  1. 1 2 3 4 5 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. Bibcode:2007A&A...474..653V. arXiv:0708.1752Freely accessible. doi:10.1051/0004-6361:20078357.Vizier catalog entry
  2. Bakker; et al. (1998). "Spectral variability of the binary HR 4049". Astronomy and Astrophysics. 336 (1): 263–275. Bibcode:1998A&A...336..263B. arXiv:astro-ph/9802120Freely accessible.
  3. Takeda, Y.; Parthasarathy, M.; Aoki, W.; Ita, Y.; Nakada, Y.; Izumiura, H.; Noguchi, K.; Takada-Hidai, M.; Sato, B.; Tajitsu, A.; Honda, S.; Kawanomoto, S.; Ando, H.; Karoji, H. (2002). "Detection of Zinc in the Very Metal-Poor Post-AGB Star HR 4049". Publications of the Astronomical Society of Japan. 54 (5): 765. Bibcode:2002PASJ...54..765T. doi:10.1093/pasj/54.5.765.
  4. Malek, S. E.; Cami, J. (2014). "The Gas-Rich Circumbinary Disk of Hr 4049. I. A Detailed Study of the Mid-Infrared Spectrum". The Astrophysical Journal. 780: 41. Bibcode:2014ApJ...780...41M. arXiv:1310.6361Freely accessible. doi:10.1088/0004-637X/780/1/41.
  5. 1 2 "AG Antliae". SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg. Retrieved 15 June 2014.
  6. Acke, B.; Degroote, P.; Lombaert, R.; De Vries, B. L.; Smolders, K.; Verhoelst, T.; Lagadec, E.; Gielen, C.; Van Winckel, H.; Waelkens, C. (2013). "Amorphous carbon in the disk around the post-AGB binary HR 4049". Astronomy & Astrophysics. 551: A76. Bibcode:2013A&A...551A..76A. doi:10.1051/0004-6361/201219282.
  7. Waelkens, C.; Lamers, H.; Waters, R. (September 1987). "HR 4049 - an old low-mass star disguised as a young massive supergiant". ESO Messenger. 49: 29–32. Bibcode:1987Msngr..49...29W.
  8. Geballe, T. R.; Noll, K. S.; Whittet, D. C. B.; Waters, L. B. F. M. (1989). "Unusual features of the 1-4 micron spectrum of HR 4049". The Astrophysical Journal. 340: L29. Bibcode:1989ApJ...340L..29G. doi:10.1086/185431.
  9. VSX (4 January 2010). "AG Antliae". The International Variable Star Index. American Association of Variable Star Observers. Retrieved 15 June 2013.
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.