Astronomy:HD 30442

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Short description: Star in the constellation Camelopardalis
HD 30442
Observation data
Equinox J2000.0]] (ICRS)
Constellation Camelopardalis
Right ascension  04h 52m 05.2195s[1]
Declination +63° 30′ 19.5173″[1]
Apparent magnitude (V) 5.47±0.01[2]
Characteristics
Evolutionary stage AGB[3]
Spectral type M3 IIIab[4]
U−B color index +1.76[5]
B−V color index +1.55[5]
Astrometry
Radial velocity (Rv)−37±0.3[6] km/s
Proper motion (μ) RA: +38.424[1] mas/yr
Dec.: −94.026[1] mas/yr
Parallax (π)8.098 ± 0.1027[1] mas
Distance403 ± 5 ly
(123 ± 2 pc)
Absolute magnitude (MV)−0.44[7]
Details
Mass1.09[8] M☉
Radius70.85[9] R☉
Luminosity1,096+106−96[10] L☉
Surface gravity (log g)0.92[8] cgs
Temperature3,500±150[10] K
Metallicity [Fe/H]0.00[10] dex
Other designations
BD+63° 543, FK5 2362, GC 5881, HD 30442, HIP 22626, HR 1527, SAO 13291, WDS J04521+6330A[11]
Database references
SIMBADdata

HD 30442 (HR 1527) is a solitary[12] star in the northern circumpolar constellation Camelopardalis. It is faintly visible to the naked eye with an apparent magnitude of 5.47[2] and is estimated to be 403 light years away from the Solar System.[1] The object has a heliocentric radial velocity of −37 km/s, indicating that it is drifting closer.[6]

HD 30442 has a stellar classification of M3 IIIab,[4] indicating that it is a red giant. It is an asymptotic giant branch[3] star currently generating energy using hydrogen and helium shells around a inert carbon core. It has 109% the mass of the Sun[8] and has an enlarged radius of 70.8 R☉[9] due to its evolved state. It radiates at almost 1,100 times the luminosity of the Sun from its photosphere at an effective temperature of 3,500 K,[10] giving a red hue. HD 30442 is estimated to have a solar metallicity,[8] with an abundance of iron equivalent to that of the Sun.

HD 30442 has a companion 120″ away along a position angle of 350°.[13] It shares a common proper motion with HD 30442, suggesting physical relation, but its parallax indicates otherwise.[14]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G.  Gaia EDR3 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 Eggen, Olin J. (July 1992). "Asymptotic giant branch stars near the sun". The Astronomical Journal 104: 275. doi:10.1086/116239. ISSN 0004-6256. Bibcode: 1992AJ....104..275E. 
  4. ↑ 4.0 4.1 Yamashita, Y. (1967). "MK Spectral Types of Bright M-Type Stars". Publications of the Dominion Astrophysical Observatory Victoria 13: 44. ISSN 0078-6950. Bibcode: 1967PDAO...13...47Y. 
  5. ↑ 5.0 5.1 Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data. SIMBAD, Bibcode: 1986EgUBV........0M 
  6. ↑ 6.0 6.1 Famaey, B.; Jorissen, A.; Luri, X.; Mayor, M.; Udry, S.; Dejonghe, H.; Turon, C. (January 2005). "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters". Astronomy and Astrophysics 430: 165. doi:10.1051/0004-6361:20041272. Bibcode: 2005A&A...430..165F. 
  7. ↑ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation" (in en). Astronomy Letters 38 (5): 331–346. doi:10.1134/S1063773712050015. ISSN 1063-7737. Bibcode: 2012AstL...38..331A. 
  8. ↑ 8.0 8.1 8.2 8.3 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. 
  9. ↑ 9.0 9.1 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. 
  10. ↑ 10.0 10.1 10.2 10.3 Charbonnel, C.; Lagarde, N.; Jasniewicz, G.; North, P. L.; Shetrone, M.; Krugler Hollek, J.; Smith, V. V.; Smiljanic, R. et al. (January 2020). "Lithium in red giant stars: Constraining non-standard mixing with large surveys in the Gaia era". Astronomy & Astrophysics 633: A34. doi:10.1051/0004-6361/201936360. ISSN 0004-6361. Bibcode: 2020A&A...633A..34C. 
  11. ↑ "HD 30442". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+30442. 
  12. ↑ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society 389 (2): 869–879, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E 
  13. ↑ 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. 
  14. ↑ Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G.  Gaia EDR3 record for this source at VizieR.

External links



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