Astronomy:NO Apodis

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Short description: Star in the constellation Apus
NO Apodis
Apus constellation map.svg
Red circle.svg
location of NO Apodis in red
Observation data
Equinox J2000.0]] (ICRS)
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[1] mas/yr
Dec.: −43.943[1] mas/yr
Parallax (π)4.1479 ± 0.0741[1] mas
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
NO Aps, NSV 8609, CD−80°638, CPD−80°828, FK5 1455, GC 23550, HD 156513, HIP 85760, HR 6429, SAO 258769[13]
Database references
SIMBADdata

NO Apodis is a solitary,[14] red hued variable star located in the southern circumpolar constellation Apus. It has an average apparent magnitude of 5.86,[15] 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.[16] During this timeframe, the star flucates between 5.71 and 5.95 in the visual band.[2]

Periods of NO Apodis[16]
Period Days Amplitude
1 26.2 0.04
2 26.6 0.092

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G.  Gaia EDR3 record for this source at VizieR.
  2. ↑ 2.0 2.1 2.2 Watson, Christopher (25 August 2009). "NO Apodis". The International Variable Star Index. American Association of Variable Star Observers. http://www.aavso.org/vsx/index.php?view=detail.top&oid=815. Retrieved 31 March 2015. 
  3. ↑ 3.0 3.1 Eggen, Olin J. (July 1992). "Asymptotic giant branch stars near the sun". The Astronomical Journal 104: 275. doi:10.1086/116239. ISSN 0004-6256. Bibcode: 1992AJ....104..275E. 
  4. ↑ 4.0 4.1 Houk, N.; Cowley, A. P. (1975). University of Michigan Catalogue of two-dimensional spectral types for the HD stars. Volume I. Declinations −90° to −53°. Bibcode: 1975mcts.book.....H. 
  5. ↑ 5.0 5.1 Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory 4: 99–110. Bibcode: 1966CoLPL...4...99J. 
  6. ↑ Samus’, N. N.; Kazarovets, E. V.; Durlevich, O. V.; Kireeva, N. N.; Pastukhova, E. N. (January 2017). "General catalogue of variable stars: Version GCVS 5.1". Astronomy Reports 61 (1): 80–88. doi:10.1134/S1063772917010085. ISSN 1063-7729. Bibcode: 2017ARep...61...80S. 
  7. ↑ 7.0 7.1 Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters 32 (11): 759–771. doi:10.1134/S1063773706110065. ISSN 1063-7737. Bibcode: 2006AstL...32..759G. 
  8. ↑ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331–346. doi:10.1134/S1063773712050015. ISSN 1063-7737. Bibcode: 2012AstL...38..331A. 
  9. ↑ 9.0 9.1 Kervella, Pierre; Arenou, Frédéric; Thévenin, Frédéric (2022). "Stellar and substellar companions from Gaia EDR3". Astronomy & Astrophysics 657: A7. doi:10.1051/0004-6361/202142146. ISSN 0004-6361. Bibcode: 2022A&A...657A...7K. 
  10. ↑ 10.0 10.1 10.2 10.3 Stassun, Keivan G. et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. ISSN 0004-6256. Bibcode: 2019AJ....158..138S. 
  11. ↑ 11.0 11.1 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  12. ↑ Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  13. ↑ "NO Aps". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NO+Aps. 
  14. ↑ Eggleton, P. P.; Tokovinin, A. A. (11 September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society 389 (2): 869–879. doi:10.1111/j.1365-2966.2008.13596.x. ISSN 0035-8711. Bibcode: 2008MNRAS.389..869E. 
  15. ↑ Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P. et al. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27–L30. ISSN 0004-6361. Bibcode: 2000A&A...355L..27H. 
  16. ↑ 16.0 16.1 Tabur, V.; Bedding, T. R.; Kiss, L. L.; Moon, T. T.; Szeidl, B.; Kjeldsen, H. (21 December 2009). "Long-term photometry and periods for 261 nearby pulsating M giants". Monthly Notices of the Royal Astronomical Society 400 (4): 1945–1961. doi:10.1111/j.1365-2966.2009.15588.x. ISSN 0035-8711. Bibcode: 2009MNRAS.400.1945T. 
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