NO Apodis

NO Apodis
location of NO Apodis in red
Observation data
Epoch J2000      Equinox J2000
Constellation Apus
Right ascension 17h 31m 27.4667s[1]
Declination −80° 51′ 32.8761″[1]
Apparent magnitude (V) 5.71-5.95[2]
Characteristics
Evolutionary stage AGB[3]
Spectral type M3 III[4]
U−B color index +1.80[5]
B−V color index +1.67[5]
Variable type Semiregular[6]
Astrometry
Radial velocity (Rv)−18.3±0.6[7] km/s
Proper motion (μ) RA: −3.662 mas/yr[1]
Dec.: −43.943 mas/yr[1]
Parallax (π)4.1479 ± 0.0741 mas[1]
Distance790 ± 10 ly
(241 ± 4 pc)
Absolute magnitude (MV)−1.32[8]
Details
Mass1.63[9] M☉
Radius107[10] R☉
Luminosity1,408[11] L☉
Surface gravity (log g)1.7±0.1[12] cgs
Temperature3,521±122[10] K
Other designations
59 G. Apodis[13], NO Aps, NSV 8609, CD−80°638, CPD−80°828, FK5 1455, GC 23550, HD 156513, HIP 85760, HR 6429, SAO 258769[14]
Database references
SIMBADdata

NO Apodis is a solitary,[15] red hued variable star located in the southern circumpolar constellation Apus. It has an average apparent magnitude of 5.86,[16] allowing it to be faintly seen with the naked eye. The object is relatively far at a distance of 790 light years[1] but is drifting closer with a heliocentric radial velocity −18.3 km/s.[7]

A light curve for NO Apodis, plotted from Hipparcos data. The data has been folded with the 24.9 day period listed in the International Variable Star Index.[2]

NO Apodis has a stellar classification of M3 III,[4] indicating that it is a red giant. It is currently on the asymptotic giant branch,[3] fusing hydrogen and helium shells around an inert carbon core. At present it has 1.63 times the mass of the Sun[9] and an enlarged radius of 107 R☉.[10] It shines with a bolometric luminosity 1,408 times that of the Sun[11] from its photosphere at an effective temperature of 3,521 K.[10]

NO Apodis is classified as a semiregular variable of unknown subtype. Observations from Tabur et. al. (2009) reveal it to have two periods, both lasting 26-7 days.[17] During this timeframe, the star flucates between 5.71 and 5.95 in the visual band.[2]

Periods of NO Apodis[17]
Period Days Amplitude
1 26.2 0.04
2 26.6 0.092
  1. ^ a b c d e Cite error: The named reference EDR3 was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference AAVSONO was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Eggen1992 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Houk1975 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Johnson1966 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Samus2017 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Kervella2021 was invoked but never defined (see the help page).
  10. ^ a b c d Cite error: The named reference Stassun2019 was invoked but never defined (see the help page).
  11. ^ a b Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference GouldNEW was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  16. ^ Cite error: The named reference Tycho2000 was invoked but never defined (see the help page).
  17. ^ a b Cite error: The named reference Tabur2009 was invoked but never defined (see the help page).