V Aquilae

Source: Wikipedia, the free encyclopedia.
V Aquilae
Location of V Aquilae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Aquila
Right ascension 19h 04m 24.155s[1]
Declination −05° 41′ 05.44″[1]
Apparent magnitude (V) 6.6 - 8.4[2]
Characteristics
Spectral type C5,4-C6,4(N6)[2]
B−V color index +4.32[3]
Variable type
SRb[2]
Distance
1,300 ± 100 ly
(400 ± 40 pc)
Absolute magnitude (MV)−5.19[6]
Details
dex
Other designations
BD−05 4858, HD 177336, HIP 93666, HR 7220, SAO 142985[11]
Database references
SIMBADdata

V Aquilae (V Aql) is a carbon star and semiregular variable star in the constellation Aquila. It has an apparent magnitude which varies between 6.6 and 8.4 and is located around 400 parsecs (1,300 ly) away.

V Aquilae is a type of star with a spectrum that is dominated by strong

C2 and CN, hence known as carbon stars. The enhanced levels of carbon in the atmosphere originate from recently nucleosynthesized material that has been dredged up to the surface by deep convection during temporary shell burning events known as thermal pulses. Published spectral types for the star vary somewhat from C54 to C64, or N6 under an older system of classification.[2][12]
The subscript 4 refers to the strength of the molecular carbon bands in the spectrum, an indicator of the relatively abundances of carbon in the atmosphere.

A light curve for V Aquilae, plotted from Hipparcos data[13]

V Aquilae is a variable star of type

SRb.[10] It has a published period of 400 days, but other periods are found including 350 days and 2,270 days.[14]

References

  1. ^
    S2CID 18759600.Vizier catalog entry
  2. ^
    Bibcode:2009yCat....102025S
    .
  3. Bibcode:1978A&AS...34....1N
    .
  4. Bibcode:1953GCRV..C......0W
    .
  5. ^
    doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR
    .
  6. S2CID 54918450
    .
  7. S2CID 131780028
    .
  8. ^
    S2CID 73594365
    .
  9. ^
    S2CID 96447896
    .
  10. ^
    doi:10.1086/191145
    .
  11. ^ "V* V Aql -- Semi-regular pulsating Star". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 2010-10-06.
  12. Bibcode:2014yCat....1.2023S
    .
  13. ^ "Hipparcos Tools Interactive Data Access". Hipparcos. ESA. Retrieved 8 December 2021.
  14. doi:10.1086/345715
    .

External links
Retrieved from "https://en.wikipedia.org/w/index.php?title=V_Aquilae&oldid=1124788309"