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Rho Puppis

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Not to be confused with R Puppis.
"Tureis" redirects here. For the other star traditionally named Tureis, see Iota Carinae.
ρ Puppis
Location of ρ Puppis (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Puppis
Right ascension 08h 07m 32.64882s[1]
Declination −24° 18′ 15.5679″[1]
Apparent magnitude (V) 2.78[2] (2.68 – 2.87)[3]
Characteristics
Spectral type F5IIkF2IImF5II[4]
U−B color index +0.17[2]
B−V color index +0.40[2]
Variable type δ Sct[5]
Astrometry
Radial velocity (Rv)+46.1[6] km/s
Proper motion (μ) RA: –83.35[1] mas/yr
Dec.: +46.23[1] mas/yr
Parallax (π)51.33 ± 0.15 mas[1]
Distance63.5 ± 0.2 ly
(19.48 ± 0.06 pc)
Absolute magnitude (MV)1.41[7]
Details
Mass1.5±0.1[8] M☉
Radius3.52±0.07[8] R☉
Luminosity24.0±0.2[9] L☉
Surface gravity (log g)3.58±0.14[9] cgs
Temperature6,650±100[9] K
Metallicity [Fe/H]0.35[10] dex
Rotational velocity (v sin i)13±1[9] km/s
Age2[11] Gyr
Other designations
ρ Puppis, 15 Puppis, CPD−23°3368, FK5 308, HD 67523, HIP 39757, HR 3185, SAO 175217[12]
Database references
SIMBADdata

Rho Puppis (ρ Puppis, abbreviated Rho Pup, ρ Pup), formally named Tureis /ˈtjʊəreɪs/,[13] is a star in the southern constellation of Puppis. With an average apparent visual magnitude of 2.78,[2] it is the third-brightest member of this generally faint constellation. Based upon parallax measurements made during the Hipparcos mission, Rho Puppis is located at a distance of 63.5 light-years (19.5 parsecs) from the Sun.[1] It is the prototype of the Rho Puppis class of evolved Am stars.

Nomenclature

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ρ Puppis (Latinised to Rho Puppis) is the star's Bayer designation.

It bore the traditional name Tureis or Turais, from the Arabic تُرَيْس turays "shield" (diminutive), which was shared by Iota Carinae.[14] In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN)[15] to catalogue and standardize proper names for stars. The WGSN approved the name Tureis for this star on 12 September 2016 and it is now so entered in the IAU Catalog of Star Names (Iota Carinae was given the name Aspidiske on 20 July 2016).[13]

Properties

[edit]
A light curve for Rho Puppis, plotted from TESS data[16]

At present Rho Puppis is moving away from the Sun with a radial velocity of +46.1 km s−1. The closest approach occurred about 394,000 years ago when it came within roughly 11.6 ly (3.6 pc) of the Solar System; about the same distance as Procyon in the present era.[17]

The variability of this star was announced in 1956 by American astronomer Olin J. Eggen.[5] It was determined to be a Delta Scuti-type variable star, making it one of the first stars of that type to be identified. Photometric observations dating back to 1946 provide a lengthy record of its pattern of pulsation; it undergoes periodic pulsations with a single period of 0.14088143(3) days,[18] or 7.1 cycles per day. During each cycle, the star's magnitude varies with an amplitude of 0.15 and the radial velocity varies by 10 km s−1. The peak brightness occurs 28.8 minutes following the minimum radial velocity.[5] The outer atmosphere's effective temperature of 6,650 K[9] is one of the lowest known for a Delta Scuti variable.[5] In 2017, a magnetic field was discovered around Rho Puppis, making it the second Delta Scuti star known to have a magnetic field, after HD 188774.[19]

Rho Puppis has an estimated age of about 2 billion years[11] and it has 3.52 times the Sun's radius.[8] It has a stellar classification of F5IIkF2IImF5II.[4] This complex format indicates that ρ Puppis is an Am star, with relatively weak lines of calcium and strong lines of other metals. The spectral type indicated by the calcium k line is F5, while that indicated by heavier metal absorption lines is F2. The roman numerals indicate a luminosity class of bright giant. Most such stars are found in binary star systems,[20] but this appears to be an exception as no companion has been discovered.[11][21] Evolved stars with Am-like peculiarities of abundance have come to be known as ρ Puppis stars.[22] The star's metallicity is more than double that in the Sun.[10]

This star shows an excess emission of infrared radiation, suggesting that there is a circumstellar disk of dust orbiting this star. The mean temperature of the emission is 85 K, corresponding to an orbital separation from the host star of 50 AU.[23][11]

References

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  1. ^ a b c d e f van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600
  2. ^ a b c d Bookmeyer, B. B.; et al. (August 1977), "Photoelectric UBV observations of RR Lyrae variable stars. Second list", Revista Mexicana de Astronomía y Astrofísica, 2: 235–258, Bibcode:1977RMxAA...2..235B
  3. ^ Samus', N. N; et al. (2017), "General catalogue of variable stars", Astronomy Reports, GCVS 5.1, 61 (1): 80, Bibcode:2017ARep...61...80S, doi:10.1134/S1063772917010085, S2CID 125853869
  4. ^ a b Gray, R. O; Corbally, C. J; Garrison, R. F; McFadden, M. T; Robinson, P. E (2003), "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 Parsecs: The Northern Sample. I", The Astronomical Journal, 126 (4): 2048, arXiv:astro-ph/0308182, Bibcode:2003AJ....126.2048G, doi:10.1086/378365, S2CID 119417105
  5. ^ a b c d Mathias, P.; et al. (November 1997), "A spectroscopic study of the delta Scuti star rho Puppis", Astronomy and Astrophysics, 327: 1077–1086, Bibcode:1997A&A...327.1077M
  6. ^ Evans, D. S. (June 20–24, 1966), Batten, Alan Henry; Heard, John Frederick (eds.), "The Revision of the General Catalogue of Radial Velocities", Determination of Radial Velocities and Their Applications, Proceedings from IAU Symposium No. 30, 30, University of Toronto: International Astronomical Union: 57, Bibcode:1967IAUS...30...57E
  7. ^ Ammler-von Eiff, Matthias; Reiners, Ansgar (June 2012), "New measurements of rotation and differential rotation in A-F stars: are there two populations of differentially rotating stars?", Astronomy & Astrophysics, 542: A116, arXiv:1204.2459, Bibcode:2012A&A...542A.116A, doi:10.1051/0004-6361/201118724, S2CID 53666672
  8. ^ a b c Antoci, V.; Handler, G.; Grundahl, F.; Carrier, F.; Brugamyer, E. J.; Robertson, P.; Kjeldsen, H.; Kok, Y.; Ireland, M.; Matthews, J. M. (2013-10-21), "Searching for solar-like oscillations in the δ Scuti star ρ Puppis", Monthly Notices of the Royal Astronomical Society, 435 (2): 1563–1575, arXiv:1307.7589, doi:10.1093/mnras/stt1397, ISSN 1365-2966
  9. ^ a b c d e Nardetto, N.; Poretti, E.; Rainer, M.; Guiglion, G.; Scardia, M.; Schmid, V. S.; Mathias, P. (2014-01-01), "Understanding the dynamical structure of pulsating stars - HARPS spectroscopy of the δ Scuti stars ρ Puppis and DX Ceti", Astronomy & Astrophysics, 561: A151, arXiv:1401.2089, doi:10.1051/0004-6361/201322356, ISSN 0004-6361
  10. ^ a b Burkhart, C.; Coupry, M. F. (September 1991), "The A and Am-Fm stars. I - The abundances of Li, Al, Si, and Fe", Astronomy and Astrophysics, 249 (1): 205–216, Bibcode:1991A&A...249..205B
  11. ^ a b c d Rodriguez, David R.; Zuckerman, B. (February 2012), "Binaries among Debris Disk Stars", The Astrophysical Journal, 745 (2): 147, arXiv:1111.5618, Bibcode:2012ApJ...745..147R, doi:10.1088/0004-637X/745/2/147, S2CID 73681879
  12. ^ "rho Pup", SIMBAD, Centre de données astronomiques de Strasbourg, retrieved 2012-01-25
  13. ^ a b IAU Catalog of Star Names, retrieved 28 July 2016
  14. ^ Moore, Patrick (2005), The observer's year: 366 nights of the universe, Practical Astronomy (2nd ed.), Springer, p. 346, ISBN 1-85233-884-9
  15. ^ IAU Working Group on Star Names (WGSN), International Astronomical Union, retrieved 22 May 2016
  16. ^ MAST: Barbara A. Mikulski Archive for Space Telescopes, Space Telescope Science Institute, retrieved 4 September 2022
  17. ^ García-Sánchez, J.; et al. (November 2001), "Stellar encounters with the solar system", Astronomy and Astrophysics, 379 (2): 634–659, Bibcode:2001A&A...379..634G, doi:10.1051/0004-6361:20011330
  18. ^ Moon, T.; van Antwerpen, C. (June 2009), "Period Changes in δ Scuti Stars: ρ Puppis", The Journal of the American Association of Variable Star Observers, 37 (1): 3–14, Bibcode:2009JAVSO..37....3M
  19. ^ Neiner, C.; Wade, G. A.; Sikora, J. (2017-06-11). "Discovery of a magnetic field in the δ Scuti F2m star ρ Pup". Monthly Notices of the Royal Astronomical Society: Letters. 468 (1): L46–L49. arXiv:1702.01621. Bibcode:2017MNRAS.468L..46N. doi:10.1093/mnrasl/slx023. ISSN 1745-3925.
  20. ^ Netopil, M.; et al. (November 2008), "Chemically peculiar stars and their temperature calibration", Astronomy and Astrophysics, 491 (2): 545–554, arXiv:0809.5131, Bibcode:2008A&A...491..545N, doi:10.1051/0004-6361:200810325, S2CID 14084961
  21. ^ Eggleton, P. P.; Tokovinin, A. A. (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, S2CID 14878976
  22. ^ Neiner, C; Wade, G. A; Sikora, J (2017), "Discovery of a magnetic field in the δ Scuti F2m star ρ Pup", Monthly Notices of the Royal Astronomical Society: Letters, 468 (1): L46–L49, arXiv:1702.01621, Bibcode:2017MNRAS.468L..46N, doi:10.1093/mnrasl/slx023, S2CID 119201285
  23. ^ Rhee, Joseph H.; et al. (May 2007), "Characterization of Dusty Debris Disks: The IRAS and Hipparcos Catalogs", The Astrophysical Journal, 660 (2): 1556–1571, arXiv:astro-ph/0609555, Bibcode:2007ApJ...660.1556R, doi:10.1086/509912, S2CID 11879505
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