Effects of triple alpha and CNO reaction rates on the evolution of low- mass stars

Yıl 2024, Cilt: 26 Sayı: 2, 541 - 548, 15.07.2024

Gülay İnlek , Salih Elçi

https://doi.org/10.25092/baunfbed.1424574

Öz

In this study, the effects of the energy generation rates of Triple Alpha and CNO nuclear reactions on the evolution of Main sequence star models with masses in the range of 0.65-1.2 Mʘ are investigated. Paczynski's GOB, SCH and HB7 star model programs are used for each model. The ages of stars are calculated using the original NACRE (Nuclear Astrophysics Compilation of Reactions) energy generation rates and NACRE rates reduced by ten percent. The ages of the current IT Cas and V636 Cen stars are calculated and compared with the results in the literature. Since Triple Alpha reactions are very difficult to perform in terrestrial laboratories, this theoretical model study will shed light on observational studies of low-mass and even massive stars.

Anahtar Kelimeler

Nuclear energy generation rates, low mass stars, stellar evolution

Proje Numarası

2022/081

Üçlü alfa ve CNO reaksiyon oranlarının küçük kütleli yıldızların evrimi üzerindeki etkileri

Öz

Bu çalışmada, Üçlü Alfa ve CNO nükleer reaksiyonlarının enerji oluşum oranlarının 0.65- 1.2 Mʘ aralığında kütleye sahip olan Ana kol yıldız modellerinin evrimleri üzerindeki etkileri araştırılmaktadır. Her bir model için Paczynski’nin GOB, SCH ve HB7 yıldız model programları kullanılmaktadır. Yıldızların yaşları orjinal NACRE enerji oluşum oranları ve yüzde on oranında azaltılmış NACRE (Nuclear Astrophysics Compilation of Reactions) oranları kullanılarak hesaplanır. Buna göre IT Cas ve V636 Cen yıldızlarının yaşları hesaplanmıştır ve literatürdeki sonuçlar ile karşılaştırılmıştır. Üçlü Alfa reaksiyonlarının laboratuvar ortamında gerçekleştirilmesi çok zor olduğu için bu teorik model çalışmasının, küçük kütleli ve hatta büyük kütleli yıldızların gözlemsel çalışmalarına ışık tutacaktır.

Anahtar Kelimeler

Nükleer enerji oluşum oranları, küçük kütleli yıldızlar, yıldızların evrimi

Destekleyen Kurum

BAP

Proje Numarası

2022/081

Kaynakça

• Kumar, S.S, The Astrophysical Journal, 137, 1121, (1963).
• Bahcall, J. N. ,Neutrino Astrophysics, Cambridge University Press, (1989).
• Christensen-Dalsgaard, J., Helioseismology. Reviews of Modern Physics, 74(4), 1073–1129, (2002).
• Baraffe, I., Chabrier, G., Allard, F., & Hauschildt, P. H., Evolutionary models for low-mass stars and brown dwarfs: Uncertainties and limits at very young ages. The Astrophysical Journal, 482(1), 352–359, (1998).
• Beichman, C., Benneke, B., Knutson, H., et al., Observations of Transiting Exoplanets with the James Webb Space Telescope (JWST), Publications of the Astronomical Society of the Pacific, 126(946), 1134–1173, (2014).
• Hoxie, D.T., The low-mass main-sequence: the comparison between theory and observation, Astronomy and Astrophysics, 26, 437-441, (1973).
• Popper, D.M., Orbits of detached main-sequence eclipsing binaries of types late F to K. II. UV leonis, UV piscium, and BH virginis, The Astrophysical Journal., 114, 1195-1205, (1997).
• Torres, G., Ribas, I., Absolute Dimensions of the M-Type Eclipsing Binary YY Geminorum (Castor C): A Challenge to Evolutionary Models in the Lower Main Sequence, The Astrophysical Journal., 567, 1140- 1165, (2002).
• Feiden, G. A., Chaboyer, B. and Dotter, A., Improved Age Estimation for Solar-Type Dwarfs Using Activity-Rotation Diagnostics. The Astrophysical Journal, 812(1), 29, (2015).
• Weiss, A., Serenelli, A., Kitsikis, A., and et al., Influence of two updated reaction rates on the evolution of low and intermediate mass stars, Astronomy and Astrophysics., 441,1129-1133, (2005).
• Morel, P., Provost, B., Lebreton, Y. and Thevenin, F., Implications of a new triple –α nuclear reaction rate. Consequences for Cepheids, Astronomy and Astrophysics, 520, 1-7, (2010).
• Dotter, A. and Paxton, B., Evolutionary implications of the new triple-α nuclear reaction rate for low mass stars, Astronomy and Astrophysics, 507, 1617-1619, (2009).
• Ferro, F., Lavagno, A. and Quarati, P., Temperature dependence of modified CNO nuclear reaction rates in dense stellar plasmas, Physica A, 340, 477-482, (2004).
• Angulo, C., Arnould, M., Rayet, M., et al., A compilation of charged-particle induced thermonuclear reaction rates, Nuclear Physics A, 656, 3-183, (1999).
• Paczynski,B., Acta Astronomica, 2, 20, (1970).
• Odell, A. P. and Pesnell, W.D., A New Graphical Interface for the Paczynski Stellar Evolution Code, A Half Century of Stellar Pulsation Interpretation: A Tribute to Arthur N. Cox, edited by Paul A. Bradley and Joyce A. Guzik, Proceedings of a Conference held in Los Alamos, ASP Conference Series, 135, 69, (1998).
• Peter L. Smith, Claas Heise, Jim R. Esmond, Robert L. Kurucz https://www.cfa.harvard.edu/amp/ampdata/kurucz23/sekur.html, (13.12.2023)
• Torres, G., Andersen, J., Gim´enez, A., Accurate masses and radii of normal stars: Modern results and applications, The Astronomy and Astrophysics Review, 18, 67-126, (2010).
• Clausen, J. V., Bruntt, H. , Claret, A., Larsen, A. et al., Absolute dimensions of solar-type eclipsing binaries II. V636 Centauri: A 1.05 Mʘ primary with an active, cool, oversize 0.85 Mʘ secondary, Astronomy and Astrophysics, 502, 253-265, (2009).
• Hoxie, D.T., The low-mass main-sequence: the comparison between theory and observation, Astronomy and Astrophysics, 26, 437-441, (1973).
• Popper, D. M., Orbits of detached main-sequence eclipsing binaries of types late F to K. II. UV leonis, UV piscium, and BH virginis, The Astrophysical Journal, 114, 1195-1205, (1997).
• Clausen, J.V., Baraffe, I., Claret, A., VandenBerg, D.B., Do 0.7-1.1 Msun Eclipsing Binaries Pose a Problem for Current Stellar Evolutionary Models, ASP Conference Series, 173, 265-268, (1999).
• L´opez-Morales, M., Ribas, I., Gu Bootis: A new 0.6 Mʘ detached eclipsing binary, The Astrophysical Journal, 631, 1120- 1133, (2005).
• Torres, G., Lacy, C.H., Marschall, L. A., et al.,The Eclipsing Binary V1061 Cygni: Confronting Stellar Evolution Models for Active and Inactive Solar-Type Stars, The Astrophysical Journal , 640, 1018-1038, (2006).
• Hoffmeister, C., Processing the light changes of 10 southern variable stars, Astronomy and Astrophysics, 3, 439-447, (1958).
• Imbriani, G., Costantini, H., Formicola, A., et al., The bottleneck of CNO burning and the age of Globular Clusters, Astronomy and Astrophysics, 420, 625-629, (2004).
• Brocato, E., Castellani, E. V., Villante, F.L., Nuclear burning rates and Population II stellar models, Monthly Notices of the Royal Astronomical Society, 298, 557-561, (1998).
• Monpribat, E., Martinet, S., Courtin, S., et al., A new C + C nuclear reaction rate : impact on stellar evolution , Astronomy and Astrophysics, 660, 1-12, (2022).