Delta Delphini

Delta Delphini, Latinized from δ Delphini, is a binary star[9] in the northern constellation of Delphinus. It is visible to the naked eye with an apparent visual magnitude of 4.43.[2] Based upon an annual parallax shift of 14.61 mas as seen from the Earth,[1] the system is located about 223 light years from the Sun.

A light curve for Delta Delphini, plotted from Hipparcos data[10]
Delta Delphini
Diagram showing star positions and boundaries of the Delphinus constellation and its surroundings. Delta Delphinus is circled.
Diagram showing star positions and boundaries of the Delphinus constellation and its surroundings. Delta Delphinus is circled.

A star chart of the Delphinus constellation showing the position of δ Delphinus (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Delphinus
Right ascension 20h 43m 27.53338s[1]
Declination +15° 04′ 28.4773″[1]
Apparent magnitude (V) 4.43[2] (4.38 - 4.49)[3]
Characteristics
Spectral type kA7hF1VmF1pSrEuCr:[4]
B−V color index +0.302[2]
Variable type δ Sct[3]
Astrometry
Radial velocity (Rv)9.48±0.07[5] km/s
Proper motion (μ) RA: −20.44[1] mas/yr
Dec.: −43.33[1] mas/yr
Parallax (π)14.61 ± 0.20 mas[1]
Distance223 ± 3 ly
(68.4 ± 0.9 pc)
Absolute magnitude (MV)+0.25[6]
Orbit[5]
Period (P)40.60505±0.00014 d
Semi-major axis (a)5.4676±0.0037
Eccentricity (e)0.64008±0.00018
Inclination (i)13.92±0.18°
Longitude of the node (Ω)63.73±0.33°
Periastron epoch (T)56823.5019±0.0028 MJD
Argument of periastron (ω)
(secondary)		65.07±0.32°
Semi-amplitude (K1)
(primary)		13.88±0.14 km/s
Semi-amplitude (K2)
(secondary)		15.27±0.07 km/s
Details
δ Del A
Mass1.78[5] M☉
Radius3.43[5] R☉
Luminosity32.4[5] L☉
Surface gravity (log g)3.71[7] cgs
Temperature7,440±210[5] K
Metallicity [Fe/H]−0.5[5] dex
Rotational velocity (v sin i)17[5] km/s
Age945[7] Myr
δ Del B
Mass1.62[5] M☉
Radius3.48[5] R☉
Luminosity28.8[5] L☉
Temperature7,110±180[5] K
Rotational velocity (v sin i)12[5] km/s
Other designations
δ Del, 11 Del, BD+14°4403, HD 197461, HIP 102281, HR 7928, SAO 106425[8]
Database references
SIMBADdata

This is a double-lined spectroscopic binary[9] system with an orbital period of 40.58 days.[9] The two components are nearly identical chemically peculiar stars, having a combined stellar classification of kA7hF1VmF1pSrEuCr:. This notation indicates the calcium K line matches an A7 star, the hydrogen lines an F1 star, and the metal lines an F1 star, with particularly strong lines of strontium, europium, and chromium. Each of the stars is a Delta Scuti variable, with the system having a dominant period of 0.1568 days and an amplitude of 0.0700 in magnitude.[2] Delta Delphini forms the prototype of a class of metal-lined δ Scuti subgiant or giant stars.[11]

References
  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.
  2. Chang, S.-W.; et al. (2013), "Statistical Properties of Galactic δ Scuti Stars: Revisited", The Astronomical Journal, 145 (5): 132, arXiv:1303.1031, Bibcode:2013AJ....145..132C, doi:10.1088/0004-6256/145/5/132, S2CID 118900730.
  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. Gray, R. O.; Napier, M. G.; Winkler, L. I. (April 2001), "The Physical Basis of Luminosity Classification in the Late A-, F-, and Early G-Type Stars. I. Precise Spectral Types for 372 Stars", The Astronomical Journal, 121 (4): 2148–2158, Bibcode:2001AJ....121.2148G, doi:10.1086/319956.
  5. Gardner, Tyler; et al. (2018), "Precision Orbit of δ Delphini and Prospects for Astrometric Detection of Exoplanets", The Astrophysical Journal, 855 (1), 1, arXiv:1802.00468, Bibcode:2018ApJ...855....1G, doi:10.3847/1538-4357/aaac80, S2CID 7642698.
  6. Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
  7. David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal, 804 (2): 146, arXiv:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146, S2CID 33401607.
  8. "del Del", SIMBAD, Centre de données astronomiques de Strasbourg, retrieved 2017-06-28.
  9. Liakos, Alexios; Niarchos, Panagiotis (February 2017), "Catalogue and properties of δ Scuti stars in binaries", Monthly Notices of the Royal Astronomical Society, 465 (1): 1181–1200, arXiv:1611.00200, Bibcode:2017MNRAS.465.1181L, doi:10.1093/mnras/stw2756.
  10. "Light Curve", Hipparcos ESA, ESA, retrieved 31 August 2022.
  11. Baade, D.; Bardelli, S.; Beaulieu, J. Ph.; Vogel, S. (March 1993), "A spectroscopic search for nonradial pulsations in the Delta Scuti stars Delta Delphini and Epsilon Cephei", Astronomy and Astrophysics, 269 (1–2): 195–200, Bibcode:1993A&A...269..195B.
  • Kaler, James B. (August 3, 2007), "Delta Delphini", Stars, University of Illinois, retrieved 2017-06-28.
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