Astronomy:HD 44120

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Short description: Binary star system in the constellation Pictor
HD 44120
Observation data
{{#ifeq:J2000.0|J2000.0 (ICRS)|Epoch J2000.0      Equinox J2000.0 (ICRS)| Epoch J2000.0      [[Astronomy:Equinox (celestial coordinates)|Equinox J2000.0}}
Constellation Pictor[1]
A
Right ascension  06h 16m 18.786s[2]
Declination −59° 12′ 48.61″[2]
Apparent magnitude (V) 6.44[1]
B
Right ascension  06h 16m 14.257s[3]
Declination −59° 12′ 27.41″[3]
Apparent magnitude (V) 14.03[4]
Characteristics
A
Evolutionary stage subgiant[2]
Spectral type F9.5V[5]
B−V color index 0.593±0.015[1]
B
Evolutionary stage white dwarf[6]
Spectral type DB3.2[4]
Astrometry
A
Radial velocity (Rv)−2.125±0.0003[7] km/s
Proper motion (μ) RA: −45.187[2] mas/yr
Dec.: −316.389[2] mas/yr
Parallax (π)27.7563 ± 0.0172[2] mas
Distance117.51 ± 0.07 ly
(36.03 ± 0.02 pc)
Absolute magnitude (MV)3.57[1]
B
Radial velocity (Rv)40[8] km/s
Proper motion (μ) RA: −48.359 mas/yr
Dec.: −312.181 mas/yr
Parallax (π)27.7297 ± 0.0203[3] mas
Distance117.62 ± 0.09 ly
(36.06 ± 0.03 pc)
Details
A
Mass1.214±0.040[9] M☉
Radius1.56[10] R☉
Luminosity2.93[10] L☉
Surface gravity (log g)4.10±0.03[11] cgs
Temperature6,005±70[11] K
Metallicity [Fe/H]0.09±0.06[11] dex
Rotational velocity (v sin i)3.39[12] km/s
Age4.105±0.755[9] Gyr
C
Mass0.67±0.10[13] M☉
Radius0.0130±0.0003[13] R☉
Surface gravity (log g)8.04±0.06[13] cgs
Temperature15,746±238[13] K
Other designations
GJ 9209, WDS J06163-5913[14]
A: CD−59°1275, HD 44120, HIP 29788, HR 2274, SAO 234418
C: L 182-61, WD 0615-591[4]
Database references
SIMBADA
C

HD 44120 is a wide binary star system in the southern constellation of Pictor. Although visible to the naked eye, it is a challenge to view having an apparent visual magnitude of 6.44.[1] The system is located at a distance of 118 light years from the Sun based on parallax, but it is drifting closer with a radial velocity of −2 km/s.[7] It has an absolute magnitude of 3.57.[1]

The primary member, designated component A of this system, is an F-type main-sequence star with a stellar classification of F9.5V.[5] It is a Sun-like star and has been considered a "hot" solar analog with a shallower convection zone than the Sun.[15] The estimated age of this star is about four billion years,[9] and it is spinning with a projected rotational velocity of 3.4 km/s.[12] It is chromospherically inactive.[16] The star has 1.2 times the mass of the Sun[9] and 1.6 times the Sun's radius.[10] It is radiating nearly three times the luminosity of the Sun[10] from its photosphere at an effective temperature of 6,005 K.[11]

The faint secondary companion, component C, is a magnitude 14.03 white dwarf star with a class of DB3.2,[4] indicating a helium-rich atmosphere. The object has an effective temperature of ~15,700 K with 67% of the Sun's mass but only 1.3% of the Sun's radius.[13] It has taken 155±16 Myr for the white dwarf to have cooled to the current temperature. Prior to leaving the main sequence, this star is estimated to have had 1.45+0.20
−0.16 M☉ and thus was the system primary.[6] It has an angular separation of 40.98″ along a position angle of 301.6° from the current primary. The projected separation of this co-moving pair is 1,533.9 astronomical unit|AU. Their estimated orbit has a semimajor axis of 1,702.6 AU and an orbital period of 51,100 years.[4]

A magnitude 7.61 visual companion, HD 44105, or component B, lies at an angular separation of 32.50″ along a position angle of 234° from component A, as of 2015. It was discovered as a double star by the Scottish astronomer James Dunlop and announced in 1829.[17] The parallax for this star indicates a distance of approximately 214 ly (66 pc) from the Sun.[18]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A  XHIP record for this object at VizieR.
  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. ↑ 3.0 3.1 3.2 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.
  4. ↑ 4.0 4.1 4.2 4.3 4.4 Holberg, J. B. et al. (2013), "Where are all the Sirius-like binary systems?", Monthly Notices of the Royal Astronomical Society 435 (3): 2077, doi:10.1093/mnras/stt1433, Bibcode: 2013MNRAS.435.2077H 
  5. ↑ 5.0 5.1 Gray, R. O. et al. (July 2006), "Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc—The Southern Sample", The Astronomical Journal 132 (1): 161–170, doi:10.1086/504637, Bibcode: 2006AJ....132..161G 
  6. ↑ 6.0 6.1 Zhao, J. K. et al. (February 2012), "The Initial-Final Mass Relation among White Dwarfs in Wide Binaries", The Astrophysical Journal 746 (2): 11, doi:10.1088/0004-637X/746/2/144, 144, Bibcode: 2012ApJ...746..144Z 
  7. ↑ 7.0 7.1 Soubiran, C. et al. (2018), "Gaia Data Release 2. The catalogue of radial velocity standard stars", Astronomy and Astrophysics 616: A7, doi:10.1051/0004-6361/201832795, Bibcode: 2018A&A...616A...7S 
  8. ↑ Wegner, G. (1974). "A spectroscopic survey of southern hemisphere white dwarfs - IV. Radial velocities and space motions". Monthly Notices of the Royal Astronomical Society 166 (2): 271. doi:10.1093/mnras/166.2.271. Bibcode: 1974MNRAS.166..271W. 
  9. ↑ 9.0 9.1 9.2 9.3 Delgado Mena, E. et al. (April 2019), "Abundance to age ratios in the HARPS-GTO sample with Gaia DR2. Chemical clocks for a range of [Fe/H]", Astronomy & Astrophysics 624: 24, doi:10.1051/0004-6361/201834783, A78, Bibcode: 2019A&A...624A..78D 
  10. ↑ 10.0 10.1 10.2 10.3 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. 
  11. ↑ 11.0 11.1 11.2 11.3 Aguilera-Gómez, Claudia et al. (June 2018), "Lithium abundance patterns of late-F stars: an in-depth analysis of the lithium desert", Astronomy & Astrophysics 614: 15, doi:10.1051/0004-6361/201732209, A55, Bibcode: 2018A&A...614A..55A 
  12. ↑ 12.0 12.1 Delgado Mena, E. et al. (April 2015), "Li abundances in F stars: planets, rotation, and Galactic evolution", Astronomy & Astrophysics 576: 24, doi:10.1051/0004-6361/201425433, A69, Bibcode: 2015A&A...576A..69D 
  13. ↑ 13.0 13.1 13.2 13.3 13.4 Bédard, A. et al. (2017), "Measurements of Physical Parameters of White Dwarfs: A Test of the Mass-Radius Relation", The Astrophysical Journal 848 (1): 11, doi:10.3847/1538-4357/aa8bb6, Bibcode: 2017ApJ...848...11B 
  14. ↑ "HD 44120". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+44120. 
  15. ↑ González Hernández, J. I. et al. (April 2012), Richards, M. T.; Hubeny, I., eds., "Searching for the Signatures of Terrestrial Planets in Hot Analogs", From Interacting Binaries to Exoplanets: Essential Modeling Tools, Proceedings of the International Astronomical Union, IAU Symposium 282: pp. 480–481, doi:10.1017/S1743921311028183, Bibcode: 2012IAUS..282..480G 
  16. ↑ Mason, Brian D. et al. (December 1998), "A Multiplicity Survey of Chromospherically Active and Inactive Stars", The Astronomical Journal 116 (6): 2975–2983, doi:10.1086/300654, Bibcode: 1998AJ....116.2975M 
  17. ↑ Mason, B. D. et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal 122 (6): 3466–3471, doi:10.1086/323920, Bibcode: 2001AJ....122.3466M 
  18. ↑ 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.

Coordinates: Sky map 06h 16m 19s, −59° 12′ 49″



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