Delta Serpentis

Delta Serpentis

A light curve for Delta Serpentis, plotted from TESS data[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Serpens
Right ascension 15h 34m 48.14762s[2]
Declination +10° 32′ 19.9248″[2]
Apparent magnitude (V) 3.80[3] (4.25 + 5.2)[4]
Characteristics
Spectral type A9IV + F0IV[5]
B−V color index 0.268±0.008[3]
Variable type δ Sct (A)
Astrometry
Radial velocity (Rv)−41.5±2.7[3] km/s
Proper motion (μ) RA: −71.48±0.91[2] mas/yr
Dec.: 3.64±0.64[2] mas/yr
Parallax (π)14.30 ± 0.75 mas[2]
Distance230 ± 10 ly
(70 ± 4 pc)
Absolute magnitude (MV)−0.42[3]
Details
A
Mass2.6[6] M☉
Radius5.2[7] R☉
Luminosity76[8] L☉
Surface gravity (log g)3.46[6] cgs
Temperature7,364[7] K
Metallicity [Fe/H]−0.02[6] dex
Rotational velocity (v sin i)99[9] km/s
B
Mass1.7[7] M☉
Radius2.6[7] R☉
Luminosity18.7[7] L☉
Surface gravity (log g)3.86[7] cgs
Temperature7,492[7] K
Metallicity [Fe/H]−0.17[6] dex
Rotational velocity (v sin i)84[9] km/s
Other designations
Delta Ser, 13 Serpentis, BD+11°2821, HIP 76276, ADS 9701, WDS 15348+1032[10]
A: GC 20942, HD 138918, HR 5789
B: GC 20941, HD 138917, HR 5788
Database references
SIMBADdata

Delta Serpentis, Latinized from δ Serpentis, is a binary star system in the constellation Serpens, in its head (Serpens Caput). The light from the two stars in the system give a combined apparent magnitude of +3.80,[3] which is bright enough to be visible to the naked eye. Based on parallax measurements, it is located at a distance of approximately 230 light years from the Sun.[2] The system is moving closer with a radial velocity of ~42 km/s, and may come to within 115 light-years in 1.2 million years.[3]

The primary, component A, is a yellow-white F-type subgiant with an apparent magnitude of +4.25. It is classified as a Delta Scuti type variable star and its magnitude varies by 0.04 with a period of 0.1557 days.[11] Its binary companion, component B, is also an F-type subgiant which is slightly dimmer, with a magnitude of +5.2. A and B are separated by four arcseconds in the sky,[12] and perform one orbit around their centre of mass once every 3,200 years.

  1. ^ Cite error: The named reference MAST was invoked but never defined (see the help page).
  2. ^ a b c d e f Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  3. ^ a b c d e f Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Fossati2008 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference abt1995 was invoked but never defined (see the help page).
  6. ^ a b c d Cite error: The named reference starhorse was invoked but never defined (see the help page).
  7. ^ a b c d e f g Cite error: The named reference ticv8 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference dr2a was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference royer2007 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Simbad was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Rodríguez2000 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Mason2001 was invoked but never defined (see the help page).