Astronomy:QQ Telescopii

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Short description: Delta Scuti variable; Telescopium
QQ Telescopii
Telescopium constellation map.svg
Red circle.svg
Location of QQ Telescopii (circled)
Observation data
Epoch J2000.0   Equinox (celestial coordinates)
Constellation Telescopium
Right ascension  19h 39m 41.77938s[1]
Declination −45° 16′ 42.7871″[1]
Apparent magnitude (V) 6.25[2]
Characteristics
Spectral type F2 IV[3] or F0 III:[4]
B−V color index +0.28[2]
Variable type δ Scuti[5]
Astrometry
Radial velocity (Rv)7.8±1.5[6] km/s
Proper motion (μ) RA: −22.160[1] mas/yr
Dec.: +5.375[1] mas/yr
Parallax (π)9.8017 ± 0.0327[1] mas
Distance333 ± 1 ly
(102.0 ± 0.3 pc)
Absolute magnitude (MV)+1.01[7]
Details
Mass1.68[8] M☉
Radius3.19±0.16[9] R☉
Luminosity26.1±0.2[1] L☉
Surface gravity (log g)3.73±0.12[10] cgs
Temperature7,380±136[11] K
Metallicity [Fe/H]+0.07±0.15[12] dex
Rotational velocity (v sin i)45±5[13] km/s
Age995+121−120[1] Myr
Other designations
QQ Tel, CD−45°13354, CPD−45°9764, GC 27167, HD 185139, HIP 96721, HR 7461, SAO 229800[14]
Database references
SIMBADdata

QQ Telescopii, also known as HD 185139 or simply QQ Tel, is a solitary variable star located in the southern constellation Telescopium. It has an apparent magnitude of 6.25,[2] placing it near the limit for naked eye visibility, even under ideal conditions. Gaia DR3 parallax measurements imply a distance of 333 light years[1] and it is currently receding with a heliocentric radial velocity of 7.8 km/s.[6] At its current distance, QQ Telescopii's brightness is diminished by two tenths of a magnitude due to interstellar dust[15] and it has an absolute magnitude of +1.01.[7]

A light curve for QQ Telescopii, plotted from TESS data[16]

HD 185139 was discovered to be a δ Scuti variable in 1982 by Debora W. Kurtz along with HR 151 (BG Ceti).[17] After a few years of subsequent observations, it was given the variable designation QQ Telescopii in 1985.[18] In 2002, C. Koen and colleagues attempted to identify the pulsation modes of the star.[13] The brightness of QQ Tel fluctuates by about 0.05 magnitudes in the blue passband within 1.56 hours.[5]

QQ Telescopii has a stellar classification of F2 IV,[3] indicating that it is a slightly evolved F-type subgiant. It was previously classified as kA6mF0 III[19] and A0pSr(CrSi),[20] indicating that it is either a chemically peculiar Ap star or Am star. However, Renson & Manfroid (2009) considers its chemical peculiarity to be doubtful.[21] Andersen & Nordstöm (1978) give it a class of F0 III:,[4] indicating that it is an evolved F-type giant star with uncertainty about the luminosity class. Evolutionary models place it very close to the end of its main sequence life.[1]

With 1.68 times the mass of the Sun[8] and an enlarged radius 3.19 times that of the Sun,[9] QQ Telescopii radiates 26.1 times the luminosity of the Sun[1] from its photosphere at an effective temperature of 7,380 K,[11] giving it a yellowish-white hue. It is slightly metal enriched at [Fe/H] = +0.07[12] but the value is poorly constrained. The star is estimated to be 995 million years old[1] and it spins modestly with a projected rotational velocity of 45 km/s.[13]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 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.
  2. ↑ 2.0 2.1 2.2 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. 
  3. ↑ 3.0 3.1 Houk, Nancy (1978). Michigan catalogue of two-dimensional spectral types for the HD stars: Declinations −53° to −40°. 2. Bibcode: 1978mcts.book.....H. 
  4. ↑ 4.0 4.1 Andersen, J.; Nordström, B. (July 1978). "Corrections to Spectral Types of Bright Southern Stars" (in en). Bulletin d'Information du Centre de Donnees Stellaires 15: 39. ISSN 1169-8837. Bibcode: 1978BICDS..15...39A. 
  5. ↑ 5.0 5.1 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. 
  6. ↑ 6.0 6.1 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. 
  7. ↑ 7.0 7.1 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. 
  8. ↑ 8.0 8.1 Yang, Zilu; Zhang, Liyun; Meng, Gang; Han, Xianming L.; Misra, Prabhakar; Yang, Jiawei; Pi, Qingfeng (21 December 2022). "Properties of flare events based on light curves from the TESS survey". Astronomy & Astrophysics 669: A15. doi:10.1051/0004-6361/202142710. ISSN 0004-6361. Bibcode: 2023A&A...669A..15Y. 
  9. ↑ 9.0 9.1 Kervella, P.; Thévenin, F.; Di Folco, E.; Ségransan, D. (October 2004). "The angular sizes of dwarf stars and subgiants. Surface brightness relations calibrated by interferometry". Astronomy & Astrophysics 426 (1): 297–307. doi:10.1051/0004-6361:20035930. ISSN 0004-6361. Bibcode: 2004A&A...426..297K. 
  10. ↑ Allende Prieto, C.; Lambert, D. L. (December 1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: masses, radii and effective temperatures". Astronomy and Astrophysics 352: 555–562. ISSN 0004-6361. Bibcode: 1999A&A...352..555A. 
  11. ↑ 11.0 11.1 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. Bibcode: 2019AJ....158..138S. 
  12. ↑ 12.0 12.1 Paunzen, E.; Handler, G.; Weiss, W. W.; Nesvacil, N.; Hempel, A.; Romero-Colmenero, E.; Vuthela, F. F.; Reegen, P. et al. (30 August 2002). "On the Period-Luminosity-Colour-Metallicity relation and the pulsational characteristics of λ Bootis type stars". Astronomy & Astrophysics 392 (2): 515–528. doi:10.1051/0004-6361:20020854. ISSN 0004-6361. Bibcode: 2002A&A...392..515P. 
  13. ↑ 13.0 13.1 13.2 Koen, C.; Balona, L.; van Wyk, F.; Marang, F.; Paunzen, E. (March 2002). "An attempt to identify the pulsation modes in the δ Scuti star QQ Tel". Monthly Notices of the Royal Astronomical Society 330 (3): 567–574. doi:10.1046/j.1365-8711.2002.05089.x. ISSN 0035-8711. Bibcode: 2002MNRAS.330..567K. 
  14. ↑ "V* QQ Tel". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=V%2A+QQ+Tel. 
  15. ↑ Gontcharov, George A.; Mosenkov, Aleksandr V. (28 September 2017). "Verifying reddening and extinction for Gaia DR1 TGAS main sequence stars". Monthly Notices of the Royal Astronomical Society 472 (4): 3805–3820. doi:10.1093/mnras/stx2219. ISSN 0035-8711. Bibcode: 2017MNRAS.472.3805G. 
  16. ↑ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html. 
  17. ↑ Kurtz, D. W. (1 October 1982). "The δ Scuti variability of three stars with Ap spectral classifications, HR 151, 239 and 7461". Monthly Notices of the Royal Astronomical Society 200 (3): 503–507. doi:10.1093/mnras/200.3.503. ISSN 0035-8711. Bibcode: 1982MNRAS.200..503K. 
  18. ↑ Kholopov, P. N.; Samus, N. N.; Kazarovets, E. V.; Perova, N. B. (March 1985). "The 67th Name-List of Variable Stars". Information Bulletin on Variable Stars 2681: 1. ISSN 0374-0676. Bibcode: 1985IBVS.2681....1K. 
  19. ↑ Hoffleit, Dorrit (January 1953). "The spectra and absolute magnitudes of 500 A3 - G2 stars". Annals of Harvard College Observatory 0119: 1–35. Bibcode: 1953AnHar.119....1H. 
  20. ↑ Brandi, E.; Claria, J. J. (October 1973). "Southern peculiar stars with abnormal spectra." (in en). Astronomy and Astrophysics Supplement Series 12: 79. ISSN 0365-0138. Bibcode: 1973A&AS...12...79B. 
  21. ↑ Renson, P.; Manfroid, J. (19 March 2009). "Catalogue of Ap, HgMn and Am stars". Astronomy & Astrophysics 498 (3): 961–966. doi:10.1051/0004-6361/200810788. ISSN 0004-6361. Bibcode: 2009A&A...498..961R. 
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