Spectroscopy of a chemically peculair delta scuti-type star: 60 tau

Filiz Kahraman Aliçavuş

doi:10.17776/csj.669561

Research Article

Spectroscopy of a chemically peculair delta scuti-type star: 60 tau

Year 2020, Volume: 41 Issue: 2, 433 - 442, 25.06.2020

Filiz Kahraman Aliçavuş

https://doi.org/10.17776/csj.669561

Abstract

In this study, a detailed spectroscopic analysis of 60 Tau is presented. 60 Tau is a Delta Scuti-type pulsating variable and it is also a metallic-lined (Am) star. The pulsation mechanism of Delta Scuti stars have been thought to be well understood and it was also suggested that metallic-lined stars did not exhibit pulsations. However, in recent studies, particularly with Kepler and TESS observations, many metallic-lined Delta Scuti stars have been found. Additionally, it turned out that the current pulsation mechanism of Delta Scuti stars including metallic-lined ones has not fully understood. Therefore, to make a reliable investigation for the driving mechanism of Delta Scuti variables, we need to know precise fundamental stellar (mass, radius) and atmospheric (Teff, log g, microturbulence) parameters of these variables. Hence in this study, the atmospheric parameters, projected rotational velocity and the chemical abundances of 60 Tau were obtained by using the high-resolution and high signal-to-noise spectra. The position of the star is found in the H-R diagram and the Delta Scuti instability strip using Gaia luminosity.

Keywords

Stars, chemically peculiar, spectroscopy, atmospheric parameters

Supporting Institution

the Polish National Center for Science (NCN)

Project Number

2015/18/A/ST9/00578

Thanks

I thank the Polish National Center for Science (NCN) for supporting the study through grant 2015/18/A/ST9/00578

References

[1] Aerts C., Christensen-Dalsgaard J. And Kurtz D. W., Asteroseismogly, 10th ed., Berlin, Springer, 2010; pp 50 – 52.
[2] Chang S. -W., Protopapas P., Kim D. -W. and Byun Y. -I., Statistical Properties of Galactic δ Scuti Stars: Revisited, The Astronomical Journal, 145 (2013) 132 – 142.
[3] Balona L. A., Catanzaro G., Abedigamba O. P., Ripepi V. and Smalley B., Spots on Am stars, Monthly Notices of the Royal Astronomical Society, 448 (2015) 1378 – 1388.
[4] Breger M., Metallic-Line a Stars and Pulsation, Astrophysical Journal, 162 (1970) 597 – 604.
[5] Kurtz D. W., Metallicism and pulsation: an analysis of the Delta Delphini stars, Astrophysical Journal, 32 (1976) 651 – 680.
[6] Bowman D. M., Buysschaert B., Neiner C., Pápics P. I., Oksala M. E. and Aerts C., K2 space photometry reveals rotational modulation and stellar pulsations in chemically peculiar A and B stars, Astronomy and Astrophysics, 616 (2018) 1 – 40.
[7] Nemec J. M., Balona L. A., Murphy S. J., Kinemuchi K. and Jeon Y.-B., Metal-rich SX Phe stars in the Kepler field, Monthly Notices of the Royal Astronomical Society, 466 (2017) 1290 – 1329.
[8] Preston G. W., the chemically peculiar stars of the upper main sequence, Annual Rev. Astron. Astrophys, 12 (1974) 257 – 277.
[9] Roman N. G., Morgan W. W. and Eggen O. J., The Classification of the Metallic-Line Stars, Astrophysical Journal, 107 (1948) 107 – 109.
[10] Titus J., Morgan W. W., On the Classification of the Stars. I. The Spectral Types of the Brighter Members of the Hyades Cluster, Astrophysical Journal, 92 (1940) 256 – 261.
[11] Abt H. A., The Frequency of Binaries among Metalic-Line Stars, Astrophysical Journal Supplement, 6 (1961) 37 – 76.
[12] Smalley B., Observations of convection in A-type stars, The A-Star Puzzle, held in Poprad, Slovakia, Cambridge, Cambridge University Press, 2004; pp 131 – 138.
[13] Balona A., Pulsation frequency distribution in δ Scuti stars, Monthly Notices of the Royal Astronomical Society, 452 (2015) 3073 – 3084.
[14] Smalley B., Southworth J., Pintado O. I., Gillon M., Holdsworth D. L., Anderson D. R., Barros S. C. C., Collier Cameron A., Delrez L., Faedi F., Haswell C. A., Hellier C., Horne K., Jehin E., Maxted P. F. L., Norton A. J., Pollacco D., Skillen I., Smith A. M. S., West R. G., Wheatley P. J., Eclipsing Am binary systems in the SuperWASPsurvey, Astronomy & Astrophysics, 564 (2014) 20 – 32.
[15] Kurtz D. W., Metallicism and pulsation: the marginal metallic line stars, Astrophysical Journal, 21 (1978) 869 – 880.
[16] Horan S., A photometric survey of the Hyades for delta Scuti variables, Astronomical Journal, 84 (1979) 1770 – 1774.
[17] Zhiping L., Pulsation behavior of classical Am star 60 Tauri, Astronomy and Astrophysics, 360 (2000) 185 – 188.
[18] Margoni R., Munari U. and Stagni R., Spectroscopic orbits of AM stars. I. Seven field stars, Astronomy and Astrophysics, 93 (1992) 545 – 552.
[19] Plaskett J. S., Harper W. E. and Young R. K., Fourth list of spectroscopic binaries, Journal of the Royal Astronomical Society of Canada, 13 (1919) 372 – 378.
[20] Griffin R. F., Photoelectric Radial Velocities, Paper XVIII Spectroscopic Orbits for Another 52 Binaries in the Hyades Field, Journal of Astrophysics and Astronomy, 33 (2012) 29 – 200.
[21] Gebran M.,Vick M., Monier R. and Fossati L.,Chemical composition of A and F dwarfs members of the Hyades open cluster, Astronomy and Astrophysics, 523 (2010) 13 – 29.
[22] Mayor M., Pepe F., Queloz D., Bouchy F., Rupprecht G., Lo Curto, G., Avila, G., Benz, W., Bertaux, J. -L., Bonfils X., Dall Th., Dekker H., Delabre B., Eckert W., Fleury M., Gilliotte A., Gojak D., Guzman J. C., Kohler D., Lizon J. -L., Longinotti A., Lovis C., Megevand D., Pasquini L., Reyes J., Sivan J. -P., Sosnowska D., Soto R., Udry S., van Kesteren A., Weber L., Weilenmann U., Setting new stamdards with HARPS, The messenger, 114 (2003), 20 – 24.
[23] Perruchot S., Bouchy F., Chazelas B., Díaz R. F., Hébrard G., Arnaud K., Arnold L., Avila G., Delfosse X., Boisse I., Moreaux G., Pepe F., Richaud Y., Santerne A., Sottile R., Tézier D., Higher-precision radial velocity measurements with the SOPHIE spectrograph using octagonal-section fibers, Proceedings of the SPIE, 8151 (2011) 1 – 12.
[24] Moultaka J., Ilovaisky S. A., Prugniel P., Soubiran C., ELODIE-SOPHIE: Spectroscopic archive. SF2A-2004: Semaine de l'Astrophysique Francaise, meeting held in Paris, France, June 14-18, 2004. Edited by F. Combes, D. Barret, T. Contini, F. eynadier and L. Pagani. Published by EdP-Sciences, Conference Series.
[25] Tody D., The IRAF data reduction and analysis system, IN: Instrumentation in astronomy, 627 (1986) 733 – 753.
[26] Gray R. O., Corbally C. J., Stellar Spectral Classification, Princeton University Press, 2009; pp 120-140.
[27] Gray R. O., Corbally C. J., Garrison R. F., McFadden M. T. and Robinson P. E., Contributions to the Nearby stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 Parsecs: The Northern Sample. I., The Astronomical Journal, 126 (2003) 2048 – 2059.
[28] Kahraman Aliçavuș F., Niemczura E., Polińska M., Hełminiak K. G., Lampens P., Molenda- Żakowicz J., Ukita N., Kambe E., High-resolution spectroscopy and abundance analysis of δ Scuti stars near the γ Doradus instability strip, Monthly Notices of the Royal Astronomical Society, 470 (2017) 4408 – 4420.
[29] Paunzen E., A new catalogue of Strömgren-Crawford uvbyβ photometry, Astronomy and Astrophysics, 580 (2015) 23 – 25.
[30] Moon T. T., Dworetsky M. M., Grids for the determination of effective temperature and surface gravity of B, A and F stars using uvbybeta photometry, Monthly Notices of the Royal Astronomical Society, 217 (1985) 305 – 315.
[31] Gaia Collaboration, Brown A. G. A.,Vallenari A. et al., Gaia Data Release 2. Summary of the contents and survey properties, Astronomy and Astrophysics, 616 (2018) 1 – 22.
[32] Amores E. B., Lepine J. R. D., Models for Interstellar Extinction in the Galaxy, The Astronomical Journal, 130 (3005) 659 - 673.
[33] Röser S., Schilbach E., Piskunov A. E., Kharchenko N. V., Scholz R. -D., A deep all-sky census of the Hyades, Astronomy and Astrophysics, 531 (2011) 92 – 104.
[34] Cutri R. M., Skrutskie M. F., van Dyk S., et al., 2MASS All Sky Catalog of point sources, The IRSA 2MASS All-Sky Point Source Catalog, NASA/IPAC, 2003.
[35] Boksenberg A., Evans R. G., Fowler R. G., Gardner I. S. K., Houziaux L., Humphries C. M., Jamar C., Macau D., Malaise D., Monfils A., Nandy K., Thompson G. I., Wilson R., Wroe H., The ultra-violet sky-survey telescope in the TD-IA satellite, Monthly Notices of the Royal Astronomical Society, 163 (1973) 291 – 332.
[36] Thompson G. I., Nandy K., Jamar C., Monfils A., Houziaux L., Carnochan D. J., Wilson R., Catalogue of stellar ultraviolet fluxes : a compilation of absolute stellar fluxes measured by the Sky Survey Telescope (S2/68) aboard the ESRO satellite TD-1, 1978.
[37] Cutri R. M., Wright E. L. and Conrow T., Explanatory Supplement to the WISE All-Sky Data Release Products. Explanatory Supplement to the WISE All-Sky Data Release Products, 2012.
[38] Kurucz R. L., ATLAS9 Stellar Atmosphere Programs and 2 km/s grid, Kurucz CD-ROM No. 13. Cambridge, Mass.:Smithsonian Astrophysical Observatory, 13, 1993.
[39] Kurucz, R. L., Avrett, E. H., Solar Spectrum Synthesis. I. A Sample Atlas from 224 to 300 nm, SAO Special Report, 391 (1981) 391.
[40] Catanzaro G., Leone F. and Dall T. H., Balmer lines as Teff and log g indicators for non-solar composition atmospheres. An application to the extremely helium-weak star HR 6000, Astronomy and Astrophysics, 425 (2004) 641 – 648.
[41] Kahraman Aliçavuș F., Niemczura E., De Cat P., Soydugan E., Kołaczkowski Z., Ostrowski J., Telting J. H., Uytterhoeven K., Poretti E., Rainer M., Suárez J. C., Mantegazza L., Kilmartin P., Pollard K. R., Spectroscopic survey of γ Doradus stars - I. Comprehensive atmospheric parameters and abundance analysis of γ Doradus stars, Monthly Notices of the Royal Astronomical Society, 458 (2016) 2307 – 2322.
[42] Asplund M., Grevesse N., Sauval A. J. and Scott P., the Chemical Composition of the Sun, Annual Review of Astronomy and Astrophysics, 47 (2009) 481 – 522.
[43] Flower P. J., Transformations from Theoretical Hertzsprung-Russell Diagrams to Color- Magnitude Diagrams: Effective Temperatures, B-V Colors, and Bolometric Corrections, Astrophysical journal, 469 (1996) 355 – 365.
[44] Smalley B., Antoci V., Holdsworth D. L., Kurtz D. W., Murphy S. J., De Cat P., Anderson D. R., Catanzaro G., Cameron A. C., Hellier C., Maxted P. F. L., Norton A. J., Pollacco D., Ripepi V., West R. G., Wheatley P. J., Pulsation versus metallicism in Am stars as revealed by LAMOST and WASP, Monthly Notices of the Royal Astronomical Society, 465 (2017) 2662 – 2670.
[45] Dupret M.-A., Grigahcene A., Garrido R., Gabriel M., Scuflaire R., Convection- pulsation coupling. II. Excitation and stabilization mechanisms in δ Sct and γ Dor stars, Astronomy and Astrophysics, 435 (2005) 927 – 939.