NO Apodis

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NO Apodis
Apus constellation map.svg
Red circle.svg
location of NO Apodis in red
Observation data
Epoch J2000       Equinox J2000
Constellation Apus
Right ascension 17h 31m 27.4667s [1]
Declination −80° 51′ 32.876″ [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]
Distance 790 ± 10  ly
(241 ± 4  pc)
Absolute magnitude  (MV)−1.32 [8]
Details
Mass 1.63 [9]   M☉
Radius 107 [10]   R☉
Luminosity 1,408 [11]   L☉
Surface gravity (log g)1.7±0.1 [12]   cgs
Temperature 3,521±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
SIMBAD data

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. NOApsLightCurve.png
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.

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]
PeriodDaysAmplitude
126.20.04
226.60.092

References

  1. 1 2 3 4 5 6 Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics . 649: A1. arXiv: 2012.01533 . Bibcode:2021A&A...649A...1G. doi: 10.1051/0004-6361/202039657 . S2CID   227254300. (Erratum:  doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  2. 1 2 3 Watson, Christopher (25 August 2009). "NO Apodis". The International Variable Star Index. American Association of Variable Star Observers . Retrieved 31 March 2015.
  3. 1 2 Eggen, Olin J. (July 1992). "Asymptotic giant branch stars near the sun". The Astronomical Journal. 104: 275. Bibcode:1992AJ....104..275E. doi:10.1086/116239. ISSN   0004-6256.
  4. 1 2 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. 1 2 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. Bibcode:2017ARep...61...80S. doi:10.1134/S1063772917010085. ISSN   1063-7729. S2CID   125853869.
  7. 1 2 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. arXiv: 1606.08053 . Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. eISSN   1562-6873. ISSN   1063-7737. S2CID   119231169.
  8. ↑ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv: 1108.4971 . Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. eISSN   1562-6873. ISSN   1063-7737. S2CID   255204555.
  9. 1 2 Kervella, Pierre; Arenou, Frédéric; Thévenin, Frédéric (2022). "Stellar and substellar companions from Gaia EDR3". Astronomy & Astrophysics. 657: A7. arXiv: 2109.10912 . Bibcode:2022A&A...657A...7K. doi: 10.1051/0004-6361/202142146 . eISSN   1432-0746. ISSN   0004-6361.
  10. 1 2 3 4 Stassun, Keivan G.; et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv: 1905.10694 . Bibcode:2019AJ....158..138S. doi: 10.3847/1538-3881/ab3467 . ISSN   0004-6256.
  11. 1 2 Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics . 616. A1. arXiv: 1804.09365 . Bibcode: 2018A&A...616A...1G . doi: 10.1051/0004-6361/201833051 . Gaia DR2 record for this source at VizieR.
  12. ↑ Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv: 2208.00211 . Bibcode:2023A&A...674A...1G. doi: 10.1051/0004-6361/202243940 . S2CID   244398875. Gaia DR3 record for this source at VizieR.
  13. ↑ Gould, B. A., Uranometria Argentina, Reprinted and updated by Pilcher, F, archived from the original on 2012-02-27, retrieved 2012-01-06
  14. ↑ "NO Aps". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved July 27, 2022.
  15. ↑ 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. arXiv: 0806.2878 . Bibcode:2008MNRAS.389..869E. doi: 10.1111/j.1365-2966.2008.13596.x . eISSN   1365-2966. ISSN   0035-8711.
  16. ↑ Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27 –L30. Bibcode:2000A&A...355L..27H. ISSN   0004-6361.
  17. 1 2 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. arXiv: 0908.3228 . Bibcode:2009MNRAS.400.1945T. doi: 10.1111/j.1365-2966.2009.15588.x . eISSN   1365-2966. ISSN   0035-8711.
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