HR 2554

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HR 2554
Carina constellation map.svg
Red circle.svg
Location of A Carinae (circled)
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Carina
Right ascension 06h 49m 51.31414s [1]
Declination −53° 37′ 20.8182″ [1]
Apparent magnitude  (V)+4.40 [2] ( [3] )
Characteristics
Spectral type G6II + A1V [4]
U−B color index +0.61 [2]
B−V color index +0.92 [2]
R−I color index +0.45 [2]
Variable type EA [3]
Astrometry
Radial velocity (Rv)26.0 ± 0.9 [5]  km/s
Proper motion (μ)RA: −1.99 [1]   mas/yr
Dec.: 17.58 [1]   mas/yr
Parallax (π)5.99 ± 0.18  mas [1]
Distance 182 [4]   pc
Absolute magnitude  (MV)–1.58 [6]
Orbit [7]
Period (P)195.245 days
Eccentricity (e)0.00585
Inclination (i)82.7°
Semi-amplitude (K1)
(primary)		24.2535 km/s
Semi-amplitude (K2)
(secondary)		38.6 [4] km/s
Details [4]
A
Mass 3.14  M☉
Radius 31.3  R☉
Luminosity 537  L☉
Surface gravity (log g)1.94  cgs
Temperature 4,981  K
B
Mass 1.98  M☉
Radius 1.9  R☉
Luminosity25  L☉
Surface gravity (log g)4,18  cgs
Temperature 9,388  K
Metallicity −0.04
Other designations
A  Carinae, V415  Car, CCDM  J06499-5337, CD−53°1613, CPD−53°1168, GC  8972, GSC  08536-00794, HD  50337, HIP  32761, HR  2554, PPM  335506, SAO  234737, TYC  8536-794-1
Database references
SIMBAD data

HR 2554, also known as V415 Carinae and A Carinae, is an eclipsing spectroscopic binary of the Algol type in the constellation of Carina whose apparent visual magnitude varies by 0.06 magnitude and is approximately 4.39 at maximum brightness. Its primary is a G-type bright giant star and its secondary is an A-type main-sequence star. It is approximately 553 light-years from Earth.

Contents

HR 2554 A

The primary component, HR 2554 A, is a yellow G-type bright giant with a mean apparent magnitude of +4.4.

HR 2554 B

The secondary component, HR 2554 B, is a white A-type main-sequence dwarf, about three magnitudes fainter than the primary.

HR 2554 binary system

A U band light curve for V415 Carinae, adapted from Schroder and Hunsch (1992) V415CarLightCurve.png
A U band light curve for V415 Carinae, adapted from Schröder and Hünsch (1992)

HR 2554 has two components in orbit around each other, making it a binary star. The semi-major axis of the secondary's orbit is 2.17 arcseconds. The two components regularly eclipse each other, making A Carinae a variable star. Its brightness varies by 0.06 magnitude with a period equal to its orbital period of 195 days. [3]

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References

  1. 1 2 3 4 5 Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv: 0708.1752 . Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID   18759600.
  2. 1 2 3 4 HR 2554, database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., CDS ID V/50. Accessed on line August 23, 2008.
  3. 1 2 3 Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
  4. 1 2 3 4 Brown, Alexander; Bennett, Philip D.; Baade, Robert; Kirsch, Thomas; Reimers, Dieter; Hatzes, Artie P.; Kürster, Martin (2001). "Ultraviolet Eclipse Observations and Fundamental Parameters of the Binary HR 2554 (G6 II+A1 V)". The Astronomical Journal. 122 (1): 392–401. Bibcode:2001AJ....122..392B. doi: 10.1086/321125 .
  5. ↑ Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Washington. Bibcode:1953GCRV..C......0W.
  6. ↑ Ammler-von Eiff, Matthias; Reiners, Ansgar (June 2012), "New measurements of rotation and differential rotation in A-F stars: are there two populations of differentially rotating stars?", Astronomy & Astrophysics, 542: A116, arXiv: 1204.2459 , Bibcode:2012A&A...542A.116A, doi:10.1051/0004-6361/201118724, S2CID   53666672.
  7. ↑ Komonjinda, Siramas; Hearnshaw, John B.; Ramm, David J. (2011). "Orbital solutions for six spectroscopic binaries with circular or nearly circular orbits". Monthly Notices of the Royal Astronomical Society. 410 (3): 1761. Bibcode:2011MNRAS.410.1761K. doi: 10.1111/j.1365-2966.2010.17558.x .
  8. ↑ Schröder, K. P.; Hünsch, M. (April 1992). "Optical spectra of ζ Aurigae systems. IV. The January 1990 eclipse of HR 2554 : detection of chromospheric absorption and extended plasma at ≈ 105 K". Astronomy & Astrophysics. 257: 219–227. Bibcode:1992A&A...257..219S . Retrieved 22 November 2021.
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