DV Aquarii

DV Aquarii

The visual band light curve of DV Aquarii, adapted from Okazaki (1985)[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Aquarius
Right ascension 20h 58m 41.84009s[2]
Declination −14° 28′ 59.2527″[2]
Apparent magnitude (V) 5.89[3]
Characteristics
Spectral type A9 V[4]
B−V color index 0.244±0.009[5]
Variable type β Lyr[6]
Astrometry
Radial velocity (Rv)+10.3±7.4[7] km/s
Proper motion (μ) RA: −54.986[2] mas/yr
Dec.: −18.428[2] mas/yr
Parallax (π)11.2032 ± 0.1015 mas[2]
Distance291 ± 3 ly
(89.3 ± 0.8 pc)
Absolute magnitude (MV)1.25[5]
Orbit[8]
Period (P)1.5755 d
Eccentricity (e)0 (adopted)
Inclination (i)83.18±0.11[9]°
Periastron epoch (T)2426160.50 JD
Semi-amplitude (K1)
(primary)		95.5 km/s
Details
DV Aqr Aa
Mass1.70[10] M☉
Radius2.756[9] R☉
Luminosity28.8+2.6
−2.4[11] L☉
Surface gravity (log g)3.97[11] cgs
Temperature7,843±267[12] K
Rotational velocity (v sin i)103[11] km/s
Age679[12] Myr
DV Aqr Ab
Mass1.01[10] M☉
Radius1.149[9] R☉
Surface gravity (log g)4.334[9] cgs
Temperature6,056±240[9] K
Other designations
BD−15° 5848, HD 199603, HIP 103545, HR 8024, SAO 164027[13]
Database references
SIMBADdata

DV Aquarii is a binary star[10] system in the zodiac constellation of Aquarius, near the border with Capricornus. It has a peak apparent visual magnitude of 5.89,[3] which is bright enough to be visible to the naked eye. The distance can be estimated from its annual parallax shift of 11.2 mas,[2] yielding a separation of 291 light years.

This is a detached eclipsing binary system of the Beta Lyrae type. The orbital period for the system is 1.5755 days and the eccentricity is unknown and probably non-zero;[8] the orbital inclination is estimated to be 83.18°±0.11°.[9] During the primary eclipse the magnitude drops to 6.25. It descends to 6.10 with the secondary eclipse (with 6.10 being brighter than 6.25).[3] The pair have been identified as candidate Herbig Ae/Be stars,[14] and catalogued as A-type shell stars.[15]

A magnitude 10.8 star with the designation HD 358087[16] is a common proper motion companion. It is located at an angular separation of 129″ and has 78% of the Sun's mass. If it is gravitationally bound to the main system, the orbital period is estimated to be around 611,855 years[10]

This star was a part of the obsolete constellation Norma Nilotica.

  1. ^ Cite error: The named reference Okazaki was invoked but never defined (see the help page).
  2. ^ a b c d e f Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference Avvakumova2013 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference houk1978 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Adelman2002 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference AAVSODV was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference kharchenko2004 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference Paffhausen1976 was invoked but never defined (see the help page).
  9. ^ a b c d e f Cite error: The named reference Polubek2001 was invoked but never defined (see the help page).
  10. ^ a b c d Cite error: The named reference Tokovinin2008 was invoked but never defined (see the help page).
  11. ^ a b c Cite error: The named reference Zorec2012 was invoked but never defined (see the help page).
  12. ^ a b Cite error: The named reference David2015 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference Corporon1999 was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference Hauck2000 was invoked but never defined (see the help page).
  16. ^ Cite error: The named reference SIMBAD2 was invoked but never defined (see the help page).