Astronomy:HD 130458

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Short description: Double star in the constellation Apus
HD 130458
Observation data
{{#ifeq:J2000.0 (ICRS)|J2000.0 (ICRS)|Epoch J2000.0      Equinox J2000.0 (ICRS)| [[History:Epoch|Epoch J2000.0 (ICRS)]]      [[Astronomy:Equinox (celestial coordinates)|Equinox J2000.0 (ICRS)}}
Constellation Apus
A
Right ascension  14h 53m 13.6598s[1]
Declination −73° 11′ 23.837″[1]
Apparent magnitude (V) 5.77±0.01[2]
B
Right ascension  14h 53m 14.0752s[3]
Declination −73° 11′ 25.2484″[3]
Apparent magnitude (V) 7.54±0.01[2]
Characteristics
A
Evolutionary stage Horizontal branch[4]
Spectral type G7 IIIa[5] (G8 IIb)[4]
U−B color index +0.42[6]
B−V color index +0.82[6]
B
Spectral type F9 IV[5]
Astrometry
Radial velocity (Rv)+31.4 ± 2.5[7] km/s
Absolute magnitude (MV)+0.58[8]
A
Proper motion (μ) RA: +15.901[1] mas/yr
Dec.: +28.871[1] mas/yr
Parallax (π)10.5077 ± 0.3522[1] mas
Distance310 ± 10 ly
(95 ± 3 pc)
B
Proper motion (μ) RA: +20.669[3] mas/yr
Dec.: +19.875[3] mas/yr
Parallax (π)10.0654 ± 0.0476[3] mas
Distance324 ± 2 ly
(99.4 ± 0.5 pc)
Details
A
Mass1.5[9] M☉
Radius8.87[10] R☉
Luminosity54.7[11] L☉
Surface gravity (log g)2.65[9] cgs
Temperature5194±124[10] K
Metallicity [Fe/H]−0.17[9] dex
Rotational velocity (v sin i)3.6±1[12] km/s
B
Mass1.41[9] M☉
Radius2.8[13] R☉
Luminosity7.5[14] L☉
Surface gravity (log g)3.96[9] cgs
Temperature6,601[9] K
Other designations
CPD−72°1604, GC 19976, HD 130458, HIP 72833, HR 5520, SAO 257206, WDS J14532-7311AB[15]
Database references
SIMBADdata

HD 130458 (HR 5520) is a double star[16] in the southern circumpolar constellation of Apus. The pair has a combined apparent magnitude of 5.8,[6] making it faintly visible to the naked eye under ideal conditions. Parallax measurements place the system 310-24 light years away[1] and it is receding with a heliocentric radial velocity of 31.4 km/s.[7]

The primary is a red giant with a stellar classification of G7 IIIa. It was earlier classified as G8 IIb, indicating a bright giant.The dimmer component has a stellar classification of F9 IV, indicating that it is an F-type subgiant evolving onto the red giant branch. As of 2008 , the pair has an angular separation of 2.167″.[16]

At present the primary has 1.5 times the mass of the Sun[9] but has expanded to 8.9[10] times its girth. It radiates at 55[11] times the luminosity of the Sun from its enlarged photosphere at an effective temperature 5,194 K,[10] which gives it a yellow glow. Currently it spins leisurely with a projected rotational velocity of 3.6 km/s,[12] common for giants. HD 130458A is believed to be on the horizontal branch.[4]

As for the secondary component, it has 1.4 times the mass of the Sun and an effective temperature of 6,601 K, giving a yellowish white hue. [9]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 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 Fabricius, C.; Høg, E.; Makarov, V. V.; Mason, B. D.; Wycoff, G. L.; Urban, S. E. (March 2002). "The Tycho double star catalogue". Astronomy & Astrophysics 384 (1): 180–189. doi:10.1051/0004-6361:20011822. ISSN 0004-6361. Bibcode: 2002A&A...384..180F. 
  3. ↑ 3.0 3.1 3.2 3.3 3.4 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.
  4. ↑ 4.0 4.1 4.2 Corbally, C. J.; Garrison, R. F. (August 1980). "New Spectral Classifications on the MK System for Visual Double Stars". Publications of the Astronomical Society of the Pacific 92: 493. doi:10.1086/130700. ISSN 0004-6280. Bibcode: 1980PASP...92..493C. 
  5. ↑ 5.0 5.1 Corbally, C. J. (August 1984). "Close visual binaries. I - MK classifications". The Astrophysical Journal Supplement Series 55: 657. doi:10.1086/190973. ISSN 0067-0049. Bibcode: 1984ApJS...55..657C. 
  6. ↑ 6.0 6.1 6.2 Johnson, H. L. et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory 4 (99): 99, Bibcode: 1966CoLPL...4...99J 
  7. ↑ 7.0 7.1 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. 
  8. ↑ 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. 
  9. ↑ 9.0 9.1 9.2 9.3 9.4 9.5 9.6 9.7 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. 
  10. ↑ 10.0 10.1 10.2 10.3 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. ISSN 0004-6256. Bibcode: 2019AJ....158..138S. 
  11. ↑ 11.0 11.1 McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (21 November 2012). "Fundamental parameters and infrared excesses of Hipparcos stars: Parameters and IR excesses from Hipparcos". Monthly Notices of the Royal Astronomical Society 427 (1): 343–357. doi:10.1111/j.1365-2966.2012.21873.x. ISSN 0035-8711. Bibcode: 2012MNRAS.427..343M. 
  12. ↑ 12.0 12.1 De Medeiros, J. R.; Da Silva, J. R. P.; Maia, M. R. G. (20 October 2002). "The Rotation of Binary Systems with Evolved Components". The Astrophysical Journal 578 (2): 943–950. doi:10.1086/342613. ISSN 0004-637X. Bibcode: 2002ApJ...578..943D. 
  13. ↑ Montalto, M. et al. (2021). "The all-sky PLATO input catalogue". Astronomy and Astrophysics 653: A98. doi:10.1051/0004-6361/202140717. Bibcode: 2021A&A...653A..98M. 
  14. ↑ 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.
  15. ↑ "HR+5520". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HR%2B5520. 
  16. ↑ 16.0 16.1 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. 
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