Delta Serpentis

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Template:Short description

Delta Serpentis
File:DeltaSerLightCurve.png
A light curve for Delta Serpentis, plotted from TESS data[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Serpens
Right ascension Template:RA[2]
Declination Template:DEC[2]
Apparent magnitude (V) 3.80[3] (4.25 + 5.2)[4]
Characteristics
Spectral type A9IV + F0IV[5]
B−V Template:Engvar Script error: No such module "val".[3]
Variable type δ Sct (A)
Astrometry
Radial velocity (Rv)Script error: No such module "val".[3] km/s
Proper motion (μ) RA: Script error: No such module "val".[2] mas/yr
Dec.: Script error: No such module "val".[2] mas/yr
Parallax (π)14.30±0.75 mas[2]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)−0.42[3]
Details
Aa
Mass1.98[6] Template:Solar mass
Radius4.6[6] Template:Solar radius
Luminosity76[7] Template:Solar luminosity
Surface gravity (log g)3.46[8] cgs
Temperature6,430[6] K
Metallicity [Fe/H]−0.02[8] dex
Rotational velocity (v sin i)99[9] km/s
Age1.12[6] Gyr
Ab
Mass1.80[6] Template:Solar mass
Radius2.50[6] Template:Solar radius
Temperature7,270[6] K
Metallicity [Fe/H]{{{metal_fe2}}} dex
Age1.12[6] Gyr
B
Mass1.88[6] Template:Solar mass
Radius3.4[6] Template:Solar radius
Luminosity18.7[10] Template:Solar luminosity
Surface gravity (log g)3.86[10] cgs
Temperature6,660[6] K
Metallicity [Fe/H]−0.17[8] dex
Rotational velocity (v sin i)84[9] km/s
Age1.26[6] Gyr
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[11]
A: Template:Odlist
B: Template:Odlist
Database references
SIMBADdata

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Delta Serpentis, Latinized from δ Serpentis, is a hierarchical triple 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 Script error: No such module "convert". in 1.2 million years.[3]

The primary, component Aa, is a yellow-white F-type subgiant,[5] two times more massive than the Sun, but with 4.6 times the Sun's radius.[4] It is classified as a Delta Scuti type variable star and its magnitude varies by 0.04 with a period of 0.1557 days.[12] It forms a small pair with Ab, a star of undefined spectral type, with a mass 1.8 times the Sun's mass and a radius 2.5 times larger. Both are separated by Script error: No such module "val". and complete an orbit around each other every Template:Cvt.[6] They are visible with a combined apparent magnitude of +4.25.[4] The outer, 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,[13] and perform one orbit around their centre of mass once every 3,200 years.

Naming

It was a member of indigenous Arabic asterism al-Nasaq al-Yamānī, "the Southern Line" of al-Nasaqān "the Two Lines",[14] along with α Ser (Unukalhai), ε Ser (Ba, Pa), δ Oph (Yed Prior), ε Oph (Yed Posterior), ζ Oph (Han) and γ Oph (Tsung Ching).[15]

According to the catalogue of stars in the Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars, al-Nasaq al-Yamānī or Nasak Yamani were the title for two stars :δ Ser as Nasak Yamani I and ε Ser as Nasak Yamani II (exclude α Ser, δ Oph, ε Oph, ζ Oph and γ Oph)[16]

In Chinese, Script error: No such module "Lang". (Script error: No such module "Lang".), meaning Right Wall of Heavenly Market Enclosure, refers to an asterism which represents eleven old states in China and which marks the right borderline of the enclosure, consisting of δ Serpentis, β Herculis, γ Herculis, κ Herculis, γ Serpentis, β Serpentis, α Serpentis, ε Serpentis, δ Ophiuchi, ε Ophiuchi and ζ Ophiuchi.[17] Consequently, the Chinese name for δ Serpentis itself is Script error: No such module "Lang". (Script error: No such module "Lang"., Template:Langx), representing the state Qin (秦) (or Tsin),[18][19][20] together with θ Capricorni and 30 Capricorni (according to Ian Ridpath version[21]) in Twelve States (asterism).[22]

References

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  1. ↑ Script error: No such module "citation/CS1".
  2. ↑ a b c d e f Script error: No such module "Citation/CS1".
  3. ↑ a b c d e f Script error: No such module "Citation/CS1".
  4. ↑ a b c Script error: No such module "Citation/CS1".
  5. ↑ a b Script error: No such module "Citation/CS1".
  6. ↑ a b c d e f g h i j k l m Script error: No such module "Citation/CS1".
  7. ↑ Template:Cite Gaia DR2
  8. ↑ a b c Script error: No such module "Citation/CS1".
  9. ↑ a b Script error: No such module "Citation/CS1".
  10. ↑ a b Script error: No such module "Citation/CS1".
  11. ↑ Template:Cite simbad
  12. ↑ Script error: No such module "Citation/CS1".
  13. ↑ Script error: No such module "Citation/CS1".
  14. ↑ Script error: No such module "citation/CS1".
  15. ↑ Script error: No such module "citation/CS1".
  16. ↑ Script error: No such module "citation/CS1".
  17. ↑ Template:In lang 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, Template:ISBN.
  18. ↑ Star Names - R.H.Allen p.376
  19. ↑ Template:In lang AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 6 月 24 日 Template:Webarchive
  20. ↑ Template:In lang English-Chinese Glossary of Chinese Star Regions, Asterisms and Star Name Template:Webarchive, Hong Kong Space Museum. Accessed on line November 23, 2010.
  21. ↑ Script error: No such module "citation/CS1".
  22. ↑ Script error: No such module "citation/CS1".

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Template:Stars of Serpens

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