HR 2554

HR 2554
	Location of A Carinae (circled)
Observation data; Epoch J2000.0 Equinox J2000.0 (ICRS)
Constellation	Carina
Right ascension	06h 49m 51.31414s
Declination	−53° 37′ 20.8182″
Apparent magnitude (V)	+4.40 ()
Characteristics
Spectral type	G6II + A1V
U−B color index	+0.61
B−V color index	+0.92
R−I color index	+0.45
Variable type	EA
Astrometry
Radial velocity (Rv)	26.0 ± 0.9 km/s
Proper motion (μ)	RA: −1.99 mas/yr ; Dec.: 17.58 mas/yr
Parallax (π)	5.99 ± 0.18 mas
Distance	182 pc
Absolute magnitude (MV)	–1.58
Orbit
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 km/s
Details
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☉
Luminosity	25 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.

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 Schröder and Hünsch (1992)^[8]

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]

References

^ ^a ^b ^c ^d ^e 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.
^ ^a ^b ^c ^d 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.
^ ^a ^b ^c 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.
^ ^a ^b ^c ^d 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.
^ Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Washington. Bibcode:1953GCRV..C......0W.
^ 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.
^ 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.
^ 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.

[hipparcos-1] 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.

[bsc1-2] 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.

[gcvs-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.

[brown-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.

[vonEiff2012-6] 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.

[orbit-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.

[Schroeder-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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Observation data Epoch J2000.0 Equinox J2000.0 (ICRS)
Location of A Carinae (circled)
Constellation	Carina
Right ascension	06^h 49^m 51.31414^s^[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 (R_v)	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 (M_V)	–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`_☉
Luminosity	25 `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