HD 77887

Last updated
HD 77887
HD77887LightCurve.png
A light curve for HD 77887, plotted from Hipparcos data [1]
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Volans
Right ascension 09h 01m 08.5140s [2]
Declination −68° 41′ 02.1096″ [2]
Apparent magnitude  (V)5.87±0.01 [3]
Characteristics
Evolutionary stage AGB [4]
Spectral type M1 III [5]
U−B color index +1.96 [6]
B−V color index +1.63 [6]
Variable type Lb [7]
Astrometry
Radial velocity (Rv)12.6±0.4 [8]  km/s
Proper motion (μ)RA: +16.413 [2]   mas/yr
Dec.: −0.069 [2]   mas/yr
Parallax (π)4.2938 ± 0.051  mas [2]
Distance 760 ± 9  ly
(233 ± 3  pc)
Absolute magnitude  (MV)−0.78 [9]
Details [10]
Mass 1.12 [11]   M☉
Radius 56.73  R☉
Luminosity 598  L☉
Surface gravity (log g)0.9  cgs
Temperature 3,820  K
Other designations
45 G. Volantis, NSV  18118, CPD−68°879, GC  12510, HD  77887, HIP  44283, HR  3610, SAO  250421
Database references
SIMBAD data

HD 77887 (HR 3610) is a solitary star located in the southern circumpolar constellation Volans. It has an apparent magnitude of 5.87, [3] making it faintly visible to the naked eye if viewed under ideal conditions. The star is situated at a distance of about 760 light years [2] but is receding with a heliocentric radial velocity of 12.6  km/s . [8]

HD 77887 is an ageing M-type giant [5] that is currently on the asymptotic giant branch. [4] At present it has 1.12 times the mass of the Sun [11] but has expanded to 56.73 times its girth. [10] It shines at 598  L☉ from its enlarged photosphere at an effective temperature of 3,820  K , [10] which gives it a red glow. HD 77887 is suspected to be a slow irregular variable [7] whose brightness fluctuates at a tenth of a magnitude. [12] Koen and Eyer examined the Hipparcos data for the star, and found that it varied periodically, with an amplitude of 0.012 magnitudes, and a period of 4.4649 days. [13]

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References

  1. ↑ "Light Curve". Hipparcos ESA. ESA. Retrieved 11 October 2022.
  2. 1 2 3 4 5 6 Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics . 649: A1. arXiv: 2012.01533 . Bibcode:2021A&A...649A...1G. doi: 10.1051/0004-6361/202039657 . S2CID   227254300. (Erratum:  doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  3. 1 2 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H. ISSN   0004-6361.
  4. 1 2 Eggen, Olin J. (July 1992). "Asymptotic giant branch stars near the sun". The Astronomical Journal. 104: 275. Bibcode:1992AJ....104..275E. doi: 10.1086/116239 . ISSN   0004-6256.
  5. 1 2 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_ƒ0. Bibcode:1975mcts.book.....H.
  6. 1 2 Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1 January 1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99–110. Bibcode:1966CoLPL...4...99J.
  7. 1 2 Jayasinghe, T; Kochanek, C S; Stanek, K Z; Shappee, B J; Holoien, T W-S; Thompson, Toda A; Prieto, J L; Dong, Subo; Pawlak, M; Shields, J V; Pojmanski, G; Otero, S; Britt, C A; Will, D (1 July 2018). "The ASAS-SN catalogue of variable stars I: The Serendipitous Survey". Monthly Notices of the Royal Astronomical Society. 477 (3): 3145–3163. arXiv: 1803.01001 . Bibcode:2018MNRAS.477.3145J. doi: 10.1093/mnras/sty838 . ISSN   0035-8711.
  8. 1 2 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. arXiv: 1606.08053 . Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. ISSN   1063-7737. S2CID   119231169.
  9. ↑ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv: 1108.4971 . Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. ISSN   1063-7737. S2CID   255204555.
  10. 1 2 3 McDonald, I.; Zijlstra, A. A.; Watson, R. A. (2017). "Fundamental parameters and infrared excesses of Tycho-Gaia stars". Monthly Notices of the Royal Astronomical Society. 471 (1): 770. arXiv: 1706.02208 . Bibcode:2017MNRAS.471..770M. doi: 10.1093/mnras/stx1433 .
  11. 1 2 Anders, F.; et al. (1 August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy and Astrophysics. 628: A94. arXiv: 1904.11302 . Bibcode:2019A&A...628A..94A. doi: 10.1051/0004-6361/201935765 . ISSN   0004-6361. S2CID   131780028.
  12. ↑ Watson, C. L.; Henden, A. A.; Price, A. (May 2006). "The International Variable Star Index (VSX)". Society for Astronomical Sciences Annual Symposium. 25: 47. Bibcode:2006SASS...25...47W.
  13. ↑ Koen, Chris; Eyer, Laurent (March 2002). "New periodic variables from the Hipparcos epoch photometry". Monthly Notices of the Royal Astronomical Society. 331 (1): 45–59. arXiv: astro-ph/0112194 . Bibcode:2002MNRAS.331...45K. doi:10.1046/j.1365-8711.2002.05150.x. S2CID   10505995.
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