Multiple star system in the constellation Andromeda
δ Andromedae
Location of δ Andromedae (circled)
Observation dataEpoch J2000.0 Equinox J2000.0 (ICRS )
Constellation
Andromeda
Right ascension 00h 39m 19.67518s [ 1]
Declination
+30° 51′ 39.6783″[ 1]
Apparent magnitude (V)3.28[ 2]
Characteristics
Spectral type
K3 III[ 3] K4 ± 2 [ 4]
U−B color index
+1.48[ 2]
B−V color index
+1.28[ 2]
R−I color index
+0.66[ 5]
Astrometry Radial velocity (Rv )± 0.15[ 6] Proper motion (μ) RA: +114.45[ 1] mas /yr Dec.: −84.02[ 1] mas /yr Parallax (π)30.91 ± 0.15 mas [ 1] Distance 105.5 ± 0.5 ly pc ) Absolute magnitude (MV )+0.8[ 7] Orbit [ 8] Period (P)15,000 d Eccentricity (e)± 0.14Periastron epoch (T)2415568 JD Argument of periastron (ω)± 5.2Semi-amplitude 1 )± 2.7Details[ 4] δ And Aa Mass ~1.3[ 9] M ☉ Radius ± 0.3R ☉ Luminosity ± 4L ☉ Surface gravity (log g )± 0.3[ 3] cgs Temperature ± 9K Metallicity 0.04 dex Rotational velocity (v sin i )6.5[ 6] Age 3.2 Gyr δ And Ab Mass 0.6–0.8 M ☉ Other designations δ And, Delta Andromedae, Delta And ,
31 Andromedae, 31 And ,
NSV 15142,
BD +30 91,
FK5 20,
HD 3627,
HIP 3092,
HR 165,
SAO 54058,
PPM 65514,
WDS 00393+3052A[ 10] [ 11] Database references SIMBAD data
Delta Andromedae , Latinized from δ Andromedae, is a triple star [ 12] constellation of Andromeda . The system is visible to the naked eye as a point of light with a combined apparent visual magnitude of 3.28.[ 2] parallax measurements, it is located at a distance of approximately 105.5 light-years (32.3 parsecs ) from the Sun .[ 1] radial velocity of −10 km/s.[ 6]
In Chinese , 奎宿 Kuí Sù Legs (asterism)η Andromedae , 65 Piscium , ζ Andromedae , ι Piscium , ε Andromedae , π Andromedae , ν Andromedae , μ Andromedae , β Andromedae , σ Piscium , τ Piscium , 91 Piscium , υ Piscium , φ Piscium , χ Piscium and ψ1 Piscium . Consequently, the Chinese name for δ Andromedae itself is 奎宿五 Kuí Sù wǔ the Fifth Star of Legs .)[ 13] Bayer designation , it was also given the title Delta by Elijah H. Burritt in his star atlas .[ 14]
This is a long-period spectroscopic binary with an orbital period of approximately 15,000 days (41 years). The primary of the spectroscopic binary, component Aa, has a stellar classification of K3 III, indicating that it is an aging giant star .[ 3] [ 8] main sequence star after consuming the hydrogen at its core.[ 15] coronagraph . The pair have a physical separation of ± 0.13 AU [ 4] red dwarf of class M3 with a separation of at least 900 astronomical units .[ 16]
An excess of infrared emission from δ Andromedae suggested that it may be surrounded by a shell of dust.[ 3] [ 17] debris disk .[ 15]
References
^ a b c d e f van Leeuwen, F. (November 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 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 . ^ a b c d Judge, P. G.; Jordan, C.; Rowan-Robinson, M. (January 1, 1987), "Delta Andromedae (K3 III) - an IRAS source with an unusual ultraviolet spectrum", Monthly Notices of the Royal Astronomical Society 224 : 93– 106, Bibcode :1987MNRAS.224...93J , doi :10.1093/mnras/224.1.93 ^ a b c Bottom, M.; et al. (August 4, 2015), "Resolving the Delta Andromedae Spectroscopic Binary with Direct Imaging", The Astrophysical Journal 809 (1): 11, arXiv :1506.07517 Bibcode :2015ApJ...809...11B , doi :10.1088/0004-637X/809/1/11 , S2CID 32786144 ^ Hoffleit, D.; Warren Jr., W. H., "HR 165, database entry" , The Bright Star Catalogue (5th (Preliminary Version) ed.), CDS V/50 . Accessed on line August 28, 2008.^ a b c Massarotti, Alessandro; et al. (January 2008), "Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity", The Astronomical Journal , 135 (1): 209– 231, Bibcode :2008AJ....135..209M , doi :10.1088/0004-6256/135/1/209 ^ Ryon, Jenna; et al. (August 2009), "Comparing the Ca ii H and K Emission Lines in Red Giant Stars", Publications of the Astronomical Society of the Pacific , 121 (882): 842, arXiv :0907.3346 Bibcode :2009PASP..121..842R , doi :10.1086/605456 , S2CID 17821279 . ^ a b Bakos, Gustav A. (February 1976), "The spectroscopic orbit of δ Andromedae", Journal of the Royal Astronomical Society of Canada , 70 : 23– 26, Bibcode :1976JRASC..70...23B ^ Gontcharov, G.A.; Kiyaeva, O. V. (2002), "Photocentric orbits from a direct combination of ground-based astrometry with Hipparcos I. Comparison with known orbits", Astronomy and Astrophysics 647– 657: 647, Bibcode :2002A&A...391..647G , doi :10.1051/0004-6361:20020896 ^ "del And" . SIMBAD Centre de données astronomiques de Strasbourg . Retrieved August 28, 2008 .^ "Entry 00393+3052" , The Washington Double Star Catalog , United States Naval Observatory , archived from the original on 2008-04-12, retrieved 2008-08-28 ^ 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, arXiv :0806.2878 Bibcode :2008MNRAS.389..869E , doi :10.1111/j.1365-2966.2008.13596.x S2CID 14878976 . ^ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 19 日 Archived 2016-03-03 at the Wayback Machine ^ Richard Hinckley Allen (1899) Star-names and Their Meanings ^ a b Decin, G.; et al. (November 2003), "Age Dependence of the Vega Phenomenon: Observations", The Astrophysical Journal , 598 (1): 636– 644, arXiv :astro-ph/0308294 Bibcode :2003ApJ...598..636D , doi :10.1086/378800 , S2CID 16751327 ^ Kaler, James B., "DELTA AND (Delta Andromedae)" , Stars , University of Illinois , retrieved 2012-01-23 ^ Wirsich, J. (August 1998), "The Chromospheric Radiation on the Circumstellar Shell of δ Andromedae", The Astrophysical Journal , 502 (2): 909– 917, Bibcode :1998ApJ...502..909W , doi :10.1086/305935 S2CID 120614789 .
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