HD 28780

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HD 28780
Camelopardalis constellation map.svg
Red circle.svg
Location of HD 28780 on the map (circled)
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Camelopardalis
Right ascension 04h 36m 24.19802s [1]
Declination +64° 15′ 41.7609″ [1]
Apparent magnitude  (V)5.91±0.01 [2]
Characteristics
Evolutionary stage main sequence star [3]
Spectral type A1 V [4] or A1 III [5]
U−B color index −0.02 [6]
B−V color index −0.03 [6]
Astrometry
Radial velocity (Rv)−22.6±1.8 [7]  km/s
Proper motion (μ)RA: −25.398  mas/yr [1]
Dec.: −8.119  mas/yr [1]
Parallax (π)6.6785 ± 0.0412  mas [1]
Distance 488 ± 3  ly
(149.7 ± 0.9  pc)
Absolute magnitude  (MV)+0.26 [8]
Details
Mass 2.48±0.08 [9]   M☉
Radius 3.79+0.12
−0.13 [10]   R☉
Luminosity 101±2 [1]   L☉
Surface gravity (log g)3.67+0.06
−0.08 [10]   cgs
Temperature 9,616+134
−132 [3]   K
Metallicity [Fe/H]−0.21 [11]   dex
Rotational velocity (v sin i)41.3±2.0 [12]  km/s
Age 300+21
−19 [9]   Myr
Other designations
AG+64°277, BD+63°515, FK5  2336, GC  5574, HD  28780, HIP  21452, HR  1440, SAO  13196 [13]
Database references
SIMBAD data

HD 28780, also known as HR 1440, is a solitary white-hued star [14] located in the northern circumpolar constellation Camelopardalis. It has an apparent magnitude of 5.91, [2] making it faintly viisble to the naked eye under ideal conditions. Gaia DR3 parallax measurements imply a distance of 488 light-years, [1] and it is currently drifting closer with a heliocentric radial velocity of −22.6  km/s . [7] At its current distance, HD 28780's brightness is diminished by 0.33 magnitudes due to interstellar extinction [15] and it has an absolute magnitude of +0.26. [8]

HD 28780 has a stellar classification of A1 V, [4] indicating that it is an ordinary A-type main-sequence star that is generating energy via hydrogen fusion at its core. However, Abt & Morell (1995) gave a classification of A1 III, [5] indicating that it is an evolved A-type giant star that has exhausted hydrogen fusion at its core. At the age of 300 million years, [9] HD 28780 has completed 80.2% of its main sequence lifetime. [3] It has 2.48 times the mass of the Sun [9] and a slightly enlarged radius 3.79 times larger than the Sun's. [10] The star radiates 101 times the luminosity of the Sun [1] from its photosphere at an effective temperature of 9,616  K . [3] HD 28780 is metal deficient with an iron abundance 61.7% that of the Sun's ([Fe/H] = −0.21) [11] and unlike most hot stars, it spins modestly with a projected rotational velocity of 41.3  km/s . [12]

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<span class="mw-page-title-main">HD 31134</span> Star in the constellation of Camelopardalis

HD 31134, also designated as HR 1561, is a solitary star located in the northern circumpolar constellation Camelopardalis, the giraffe. It is faintly visible to the naked eye as a white-hued star with an apparent magnitude of 5.74. Gaia DR3 parallax measurements place it 473 light years away. It appears to be approaching the Solar System with a heliocentric radial velocity of −15.1 km/s. At its current distance, HD 31134's brightness is diminished by 0.35 magnitudes due to interstellar dust. It has an absolute magnitude of +0.19.

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<span class="mw-page-title-main">34 Leonis Minoris</span> Star in the constellation Leo Minor

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<span class="mw-page-title-main">V692 Coronae Australis</span> SX Areits variable; Corona Australis

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<span class="mw-page-title-main">HD 33541</span> Spectroscopic binary; Camelopardalis

HD 33541, also known as HR 1683, is a white-hued star located in the northern circumpolar constellation Camelopardalis. It has an apparent magnitude of 5.83, making it faintly visible to the naked eye. Gaia DR3 parallax measurements imply a distance of 358 light years and it is currently receding with a heliocentric radial velocity of 9.9 km/s. At its current distance HD 33541's brightness is diminished by 0.16 magnitudes due to interstellar extinction and it has an absolute magnitude of +0.58.

<span class="mw-page-title-main">HD 25274</span> M-type giant in the constellation Camelopardalis

HD 25274, also known as HR 1241, is a solitary star located in the northern circumpolar constellation Camelopardalis. It is faintly visible to the naked eye as a red hued point of light with an apparent magnitude of 5.86. Gaia DR3 parallax measurements imply a distance of 597 light-years and it is currently drifting closer with a heliocentric radial velocity of −48.23 km/s. At its current distance, HD 25274's brightness is diminished by three-tenths of a magnitude due to interstellar extinction and it has an absolute magnitude of −0.51.

<span class="mw-page-title-main">HD 27322</span> A-type dwarf; Camelopardalis

HD 27322, also known as HR 1342, is a binary star located in the northern circumpolar constellation Camelopardalis. The visible component is faintly visible to the naked eye as a white-hued point of light with an apparent magnitude of 5.92. The object is located relatively close at a distance of 313 light-years based on Gaia DR3 parallax measurements, and it is drifting closer with a heliocentric radial velocity of approximately −13 km/s. At its current distance, HD 27322's brightness is diminished by 0.24 magnitudes due to interstellar extinction and it has an absolute magnitude of +0.98.

<span class="mw-page-title-main">HD 174430</span> B-type giant in the constellation Telescopium

HD 174430, also designated as HR 7093 or rarely 32 G. Telescopii, is a solitary blue-hued star located in the southern constellation Telescopium near Kappa Telescopii. It has an apparent magnitude of 6.29, placing it near the limit for naked eye, even under ideal conditions. The object is located relatively far at a distance of 1,140 light-years based on Gaia DR3 parallax measurements, but it is drifitng closer with a heliocentric radial velocity of −23 km/s. At its current distance, HD 174430's brightness is diminished by 0.32 magnitudes due to interstellar extinction and it has an absolute magnitude of −1.80.

<span class="mw-page-title-main">HD 169904</span> B-type main-sequence star; Octans

HD 169904 is a solitary star located in the southern circumpolar constellation Octans. It has an apparent magnitude of 6.26, placing it near the limit for naked eye visibility, even under ideal conditions. Gaia DR3 parallax measurements imply a distance of 482 light-years and it is currently drifting closer with a somewhat constrained radial velocity of −6.0 km/s. At its current distance, HD 169904's brightness is diminished by 0.24 magnitudes due to interstellar extinction and it has an absolute magnitude of +0.19.

References

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  2. 1 2 Oja, T. (August 1991). "UBV photometry of stars whose positions are accurately known. VI". Astronomy and Astrophysics Supplement Series. 89: 415. Bibcode:1991A&AS...89..415O. ISSN   0365-0138.
  3. 1 2 3 4 Zorec, J.; Royer, F. (January 2012). "Rotational velocities of A-type stars IV: Evolution of rotational velocities". Astronomy & Astrophysics. 537: A120. arXiv: 1201.2052 . Bibcode:2012A&A...537A.120Z. doi: 10.1051/0004-6361/201117691 . eISSN   1432-0746. ISSN   0004-6361. S2CID   55586789.
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  5. 1 2 Abt, Helmut A.; Morrell, Nidia I. (July 1995). "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars". The Astrophysical Journal Supplement Series. 99: 135. Bibcode:1995ApJS...99..135A. doi: 10.1086/192182 . ISSN   0067-0049. S2CID   120495962.
  6. 1 2 Oja, T. (April 1983). "UVB photometry of FK4 and FK4 Supplement stars". Astronomy and Astrophysics Supplement Series. 52: 131–134. Bibcode:1983A&AS...52..131O. ISSN   0365-0138.
  7. 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. eISSN   1562-6873. ISSN   1063-7737. S2CID   119231169.
  8. 1 2 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. eISSN   1562-6873. ISSN   1063-7737. S2CID   119257644.
  9. 1 2 3 4 Grosbol, P. J. (June 1978). "Space velocities and ages of nearby early-type stars". Astronomy and Astrophysics Supplement Series . 32: 409–421. Bibcode:1978A&AS...32..409G. ISSN   0365-0138.
  10. 1 2 3 Stassun, Keivan G.; et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv: 1905.10694 . Bibcode:2019AJ....158..138S. doi: 10.3847/1538-3881/ab3467 . eISSN   1538-3881. hdl: 1721.1/124721 . S2CID   166227927.
  11. 1 2 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. arXiv: 1904.11302 . Bibcode:2019A&A...628A..94A. doi: 10.1051/0004-6361/201935765 . eISSN   1432-0746. ISSN   0004-6361. S2CID   131780028.
  12. 1 2 Ramella, M.; Boehm, C.; Gerbaldi, M.; Faraggiana, R. (January 1989). ""Normal" main sequence A0 stars of low rotational velocity". Astronomy and Astrophysics. 209: 233–243. Bibcode:1989A&A...209..233R. ISSN   0004-6361.
  13. ↑ "HD 28780". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved July 20, 2023.
  14. ↑ Eggleton, P. P.; Tokovinin, A. A. (11 September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869–879. arXiv: 0806.2878 . Bibcode:2008MNRAS.389..869E. doi: 10.1111/j.1365-2966.2008.13596.x . eISSN   1365-2966. ISSN   0035-8711. S2CID   14878976.
  15. ↑ Gontcharov, George A.; Mosenkov, Aleksandr V. (28 September 2017). "Verifying reddening and extinction for Gaia DR1 TGAS main sequence stars". Monthly Notices of the Royal Astronomical Society. 472 (4): 3805–3820. arXiv: 1709.01160 . Bibcode:2017MNRAS.472.3805G. doi: 10.1093/mnras/stx2219 . eISSN   1365-2966. ISSN   0035-8711. S2CID   118879856.
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