Astronomy:U Antliae

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Short description: Carbon star in the constellation Antlia
U Antliae
Location of U Antliae (circled)
Observation data
Equinox J2000.0]] (ICRS)
Constellation Antlia[1]
Right ascension  10h 35m 12.851s[2]
Declination −39° 33′ 45.32″[2]
Apparent magnitude (V) 5.27 - 6.04[3]
Characteristics
Evolutionary stage AGB
Spectral type C-N3[4] (C5,3[5])
U−B color index 7.10[6]
B−V color index 2.84[6]
Variable type LB[7]
Astrometry
Radial velocity (Rv)41.00[8] km/s
Proper motion (μ) RA: −31.504[2] mas/yr
Dec.: +2.619[2] mas/yr
Parallax (π)3.6154 ± 0.0943[2] mas
Distance900 ± 20 ly
(277 ± 7 pc)
Absolute magnitude (MV)−1.87[9]
Details
Mass3.1[10] M☉
Radius169[11] R☉
Luminosity4,500[12] L☉
Surface gravity (log g)1.96[10] cgs
Temperature3,394[11] K
Metallicity [Fe/H]−0.52[10] dex
Other designations
HR 4153, HD 91793, HIP 51821, CD−38°6579, 2MASS J10351285-3933453, PPM 287864, AAVSO 1030–39, SAO 201533
Database references
SIMBADdata

Coordinates: Sky map 10h 35m 12.8507s, −39° 33′ 45.319″ File:U Antliae - ALMA - Eso1730a.tif U Antliae (U Ant) is a variable star in the constellation Antlia. It is a carbon star surrounded by two thin shells of dust.

U Antliae is an extremely red C-type carbon star. These cool stars on the asymptotic giant branch are further reddened by strong mass loss and dust that forms around the star. U Antliae is calculated to have an effective surface temperature of 2,800 K, although the light that reaches us has an appearance more like that from a black body with a temperature of 2,300 K surrounded by dust at a temperature of 72 K.[13] It emits most of its radiation in the infrared and although it is only about 500 times brighter than the sun at visual wavelengths,[9] its bolometric luminosity is 8,000 times higher than the Sun's.[13]

The visual band light curve of T Antliae, from AAVSO data[14]

In 1901, Louisa Dennison Wells discovered that the brightness of the star varied, from the examination of photographic plates.[15] Annie Jump Cannon included the star, with its variable star designation U Antiliae, in her 1907 Second Catalogue of Variable Stars.[16] U Antliae is an irregular variable star with an apparent magnitude that varies between 5.27 and 6.04. Approximately 900 light years from Earth, it is surrounded by two shells of dust, thought to have been ejected 14,000 and 10,000 years ago.[17] The exact origin and structure of the shells is uncertain, possibly due to enhanced mass loss during thermal pulses, possibly due to interaction of the stellar wind with interstellar material.[13]

References

  1. ↑ Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A. 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  3. ↑ Otero, Sebastian (3 November 2011). "U Antliae". AAVSO Website. American Association of Variable Star Observers. http://www.aavso.org/vsx/index.php?view=detail.top&oid=446. 
  4. ↑ De Mello, A. B.; Lorenz-Martins, S.; De Araújo, F. X.; Bastos Pereira, C.; Codina Landaberry, S. J. (2009). "NSCC—A New Scheme of Classification of C-Rich Stars Devised from Optical and Infrared Observations". The Astrophysical Journal 705 (2): 1298. doi:10.1088/0004-637X/705/2/1298. Bibcode: 2009ApJ...705.1298D. 
  5. ↑ Yamashita, Y. (1975). "The C-classification of spectra of carbon stars. II". Tokyo 15: 47. Bibcode: 1975AnTok..15...47Y. 
  6. ↑ 6.0 6.1 Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues 2237. Bibcode: 2002yCat.2237....0D. 
  7. ↑ Samus, N. N. et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S 1. Bibcode: 2009yCat....102025S. 
  8. ↑ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters 32 (11): 759–771. doi:10.1134/S1063773706110065. Bibcode: 2006AstL...32..759G. 
  9. ↑ 9.0 9.1 Alksnis, A.; Balklavs, A.; Dzervitis, U.; Eglitis, I. (1998). "Absolute magnitudes of carbon stars from HIPPARCOS parallaxes". Astronomy and Astrophysics 338: 209. Bibcode: 1998A&A...338..209A. 
  10. ↑ 10.0 10.1 10.2 Khalatyan, A.; Anders, F.; Chiappini, C.; Queiroz, A. B. A.; Nepal, S.; Dal Ponte, M.; Jordi, C.; Guiglion, G. et al. (2024). "Transferring spectroscopic stellar labels to 217 million Gaia DR3 XP stars with SHBoost". Astronomy and Astrophysics 691: A98. doi:10.1051/0004-6361/202451427. Bibcode: 2024A&A...691A..98K. 
  11. ↑ 11.0 11.1 Stassun, Keivan G. et al. (2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. Bibcode: 2019AJ....158..138S. 
  12. ↑ Răstău, V.; Mečina, M.; Kerschbaum, F.; Olofsson, H.; Maercker, M.; Drechsler, M.; Strottner, X.; Mulato, L. (2023-12-01). "Extended far-UV emission surrounding asymptotic giant branch stars as seen by GALEX" (in en). Astronomy & Astrophysics 680: A12. doi:10.1051/0004-6361/202346120. ISSN 0004-6361. Bibcode: 2023A&A...680A..12R. 
  13. ↑ 13.0 13.1 13.2 Kerschbaum, F.; Ladjal, D.; Ottensamer, R.; Groenewegen, M. A. T.; Mecina, M.; Blommaert, J. A. D. L.; Baumann, B.; Decin, L. et al. (2010). "The detached dust shells of AQ Andromedae, U Antliae, and TT Cygni". Astronomy and Astrophysics 518: L140. doi:10.1051/0004-6361/201014633. Bibcode: 2010A&A...518L.140K. 
  14. ↑ "Download Data". AAVSO. https://www.aavso.org/data-download. 
  15. ↑ Pickering, E. C.; Colson, H. R.; Fleming, W. P.; Wells, L. D. (April 1901). "Sixty-four new variable stars". Astrophysical Journal 13: 226–230. doi:10.1086/140808. Bibcode: 1901ApJ....13..226P. 
  16. ↑ Cannon, Annie J. (1907). "Second catalogue of variable stars". Annals of Harvard College Observatory 55: 1–94. Bibcode: 1907AnHar..55....1C. 
  17. ↑ Izumiura, H.; Waters, L. B. F. M.; de Jong, T.; Loup, C.; Bontekoe, Tj. R.; Kester, D. J. M. (1997). "A double dust shell surrounding the carbon star U Antliae". Astronomy and Astrophysics 323: 449–60. Bibcode: 1997A&A...323..449I. 



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