Astronomy:HD 33519

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Short description: Binary in the constellation of Mensa
HD 33519
Observation data
Epoch J2000.0   Equinox (celestial coordinates)
Constellation Mensa
Right ascension  05h 00m 13.23704s[1]
Declination −78° 18′ 00.0987″[1]
Apparent magnitude (V) 6.28±0.01[2]
Characteristics
Evolutionary stage red giant branch[1]
Spectral type K5/M0 III[3]
U−B color index +1.87[4]
B−V color index +1.51[4]
Astrometry
Radial velocity (Rv)−2.5±2.3[5] km/s
Proper motion (μ) RA: −17.781[1] mas/yr
Dec.: +1.497[1] mas/yr
Parallax (π)3.4534 ± 0.0872[1] mas
Distance940 ± 20 ly
(290 ± 7 pc)
Absolute magnitude (MV)−0.88[6]
Details
Mass4.34[7] M☉
Radius45.4[8] R☉
Luminosity465[9] L☉
Surface gravity (log g)1.45+0.02−0.03[1] cgs
Temperature4,118±122[8] K
Metallicity [Fe/H]−0.01[10] dex
Rotational velocity (v sin i)<1[11] km/s
Other designations
CD−78°190, CPD−78°165, HD 33519, HIP 23251, HR 1682, SAO 256153, WDS J05002-7818A[12]
Database references
SIMBADdata

HD 33519, also known as HR 1682, is a probable spectroscopic binary[11] located in the southern circumpolar constellation Mensa. It is one of the stars near the limit of naked eye visibility, having an apparent magnitude of 6.28.[2] The system is relatively far at a distance of 940 light years[1] but is approaching with a heliocentric radial velocity of −2.5 km/s.[5] However, this value is poorly constrained.

The visible component has a stellar classification of K5/M0 III,[3] indicating an evolved red giant with the characteristics of a K5 and M0 giant star. At present it has 4.34 times the mass of the Sun[7] but has expanded to 45.4 times its girth.[8] It shines with a luminosity of 465 L☉[9] from its enlarged photosphere at an effective temperature of 4,118 K,[8] giving it an orange-red hue when viewed in the night sky. HD 33519's metallicity, what astronomers dub as elements heavier than helium, is around solar level.[10] Like most giants, it spins slowly, with its projected rotational velocity being lower than 1 km/s.[11]

There is an 11th magnitude optical companion located 50.2″ away along a position angle of 110°.[13] It has no relation to the system, having a drastically different proper motion.[13]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 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.
  2. ↑ 2.0 2.1 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P. et al. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27–L30. ISSN 0004-6361. Bibcode: 2000A&A...355L..27H. 
  3. ↑ 3.0 3.1 Houk, N.; Cowley, A. P. (1975). University of Michigan Catalogue of two-dimensional spectral types for the HD stars. Volume I. Declinations −90° to −53°. Bibcode: 1975mcts.book.....H. 
  4. ↑ 4.0 4.1 Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory 4: 99–110. Bibcode: 1966CoLPL...4...99J. 
  5. ↑ 5.0 5.1 Gontcharov, G. A. (November 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. ISSN 1063-7737. Bibcode: 2006AstL...32..759G. 
  6. ↑ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331–346. doi:10.1134/S1063773712050015. ISSN 1063-7737. Bibcode: 2012AstL...38..331A. 
  7. ↑ 7.0 7.1 Kervella, Pierre; Arenou, Frédéric; Thévenin, Frédéric (2022). "Stellar and substellar companions from Gaia EDR3". Astronomy & Astrophysics 657: A7. doi:10.1051/0004-6361/202142146. ISSN 0004-6361. Bibcode: 2022A&A...657A...7K. 
  8. ↑ 8.0 8.1 8.2 8.3 Stassun, Keivan G. et al. (9 September 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. 
  9. ↑ 9.0 9.1 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  10. ↑ 10.0 10.1 Anders, F. et al. (August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy & Astrophysics 628: A94. doi:10.1051/0004-6361/201935765. ISSN 0004-6361. Bibcode: 2019A&A...628A..94A. 
  11. ↑ 11.0 11.1 11.2 De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (January 2014). "A catalog of rotational and radial velocities for evolved stars". Astronomy & Astrophysics 561: A126. doi:10.1051/0004-6361/201220762. ISSN 0004-6361. Bibcode: 2014A&A...561A.126D. 
  12. ↑ "HR 1682". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HR+1682. 
  13. ↑ 13.0 13.1 Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (December 2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal 122 (6): 3466–3471. doi:10.1086/323920. ISSN 0004-6256. Bibcode: 2001AJ....122.3466M. 
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