Abstract
DF Cyg, uzay ışıkölçüm ile uzun süreli gözlenen birkaç RV Tauri yıldızından biridir. Bu çalışma kapsamında DF Cyg'nin hala tam olarak anlaşılamamış değişim doğası hem tayfsal hem de ışıkölçüm verileri yardımı ile araştırıldı. Yıldızın TESS ışıkölçüm gözlemleri ilk kez bu çalışma kapsamında analiz edildi. TESS ve Kepler verileri, yer tabanlı ışıkölçüm verileri ile birleştirilerek yıldızın, hem uzun dönemli (${\sim 770}$ gün) hem de ışık eğrisinde yer alan, birbirini takip eden, derin ve sığ minimumlarına sahip kısa dönemli (${\sim 50}$ gün) değişim doğası incelendi. DF Cyg'nin dönem analizi sonucunda 30'a yakın zonklama frekansı saptanarak ikinci bileşene ait bulgular fark edildi. Bunların yanı sıra DF Cyg için McDonald teleskobu ve Sandiford tayfçekeri ile elde edilen echelle tayflar, MCMC yöntemiyle yıldızın zonklama evresine bağlı model parametre ve dönme hız değerlerinin tespitinde kullanıldı.
Supporting Institution
Erciyes Üniversitesi Bilimsel Araştırma Projeleri Koordinasyon Birimi
Project Number
DOSAP MAP-2020-9749
Thanks
Bu çalışma Erciyes Üniversitesi Bilimsel Araştırma Projeleri Koordinasyon Birimi tarafından DOSAP MAP-2020-9749 proje numarası ile desteklenmiştir.
References
- Alcock C., et al., 1998, AJ, 115, 1921
- Allende Prieto C., 2007, AJ, 134, 1843
- Blanco-Cuaresma S., 2019, MNRAS, 486, 2075
- Bódi A., Szatmáry K., Kiss L. L., 2016, A&A, 596, A24
- Borucki W. J., Koch D. G., Basri G. S., Latham D. W., Howell S. B., 2004, in American Astronomical Society Meeting Abstracts. p.33.05
- Feinstein A. D., et al., 2019, PASP, 131, 094502
- Fokin A. B., 1994, A&A, 292, 133, ADS
- Foreman-Mackey D., Hogg D. W., Lang D., Goodman J., 2013,PASP, 125, 306
- Gehrz R. D., 1972, ApJ, 178, 715
- Gezer I., Van Winckel H., Bozkurt Z., De Smedt K., Kamath D.,Hillen M., Manick R., 2015, MNRAS, 453, 133
- Giridhar S., 2020, Journal of Astrophysics and Astronomy, 41, 44
- Howard A. H., 1989, JAAVSO, 18, 148, ADS
- Jura M., 1986, ApJ, 309, 732
- Kafka S., 2020, in European Planetary Science Congress. ppEPSC2020-314, doi:10.5194/epsc2020-314
- Kiss L. L., Bódi A., 2017, A&A, 608, A99
- Kjeldsen H., Bedding T. R., 1995, A&A, 293, 87, ADS
- Lomb N. R., 1976, Ap&SS, 39, 447
- Manick R., Van Winckel H., Kamath D., Hillen M., Escorza A., 2017,A&A, 597, A129
- Manick R., Van Winckel H., Kamath D., Sekaran S., Kolenberg K.,2018, A&A, 618, A21
- Manick R., et al., 2019, A&A, 628, A40
- Mosser B., et al., 2013, A&A, 559, A137
- Pawlak M., et al., 2019, MNRAS, 487, 5932
- Percy J. R., 2015, JAAVSO, 43, 176, ADS
- Pigulski A., Pojmański G., Pilecki B., Szczygieł D. M., 2009, ActaAstron., 59, 33, ADS
- Pollacco D. L., et al., 2006, PASP, 118, 1407
- Pollard K. R., Cottrell P. L., Kilmartin P. M., Gilmore A. C., 1996,MNRAS, 279, 949
- Preston G. W., Krzeminski W., Smak J., Williams J. A., 1963, ApJ,137, 401
- Ricker G. R., et al., 2014, in Oschmann Jacobus M. J., ClampinM., Fazio G. G., MacEwen H. A., eds, Society of Photo Optical Instrumentation Engineers (SPIE) Conference Series Vol.9143, Space Telescopes and Instrumentation 2014: Optical, Infrared, and Millimeter Wave. p. 914320 (arXiv:1406.0151),doi:10.1117/12.2063489
- Scargle J. D., 1982, ApJ, 263, 835
- Schweitzer E., Vialle J., 1993, Bulletin d’Information du Centre deDonnees Stellaires, 43, 51, ADS
- Stello D., Chaplin W. J., Basu S., Elsworth Y., Bedding T. R., 2009,MNRAS, 400, L80
- Ulrich R. K., 1986, ApJ, 306, L37
- Van Winckel H., 2018, preprint, (arXiv:1809.00871), ADS
- Van Winckel H., Waelkens C., Fernie J. D., Waters L. B. F. M.,1999, A&A, 343, 202, ADS
- Vega L. D., Stassun K. G., Montez Rodolfo J., Boyd P. T., SomersG., 2017, ApJ, 839, 48
- Vega L. D., et al., 2021, ApJ, 909, 138
- Wallerstein G., 2002, PASP, 114, 689
- Yu J., Huber D., Bedding T. R., Stello D., Hon M., Murphy S. J.,Khanna S., 2018, ApJS, 236, 42
- Zsoldos E., 1991, Information Bulletin on Variable Stars, 3557, 1,ADS
- Zsoldos E., 1998, Acta Astron., 48, 775
The Nature of the RV Tauri Star DF Cyg by Space- and Ground-Based Photometry and Spectroscopic Observations
Abstract
DF Cyg is one of the few RV Tauri stars that has been observed for long periods with space photometry. In this study, we investigate the still poorly understood variation nature of DF Cyg using both spectroscopic and photometric observations. TESS photometric data of the star were analysed for the first time in this study. By combining TESS and Kepler data with ground-based photometric data, both the long-period (${\sim 770}$ days) and the short-period (${\sim 50}$ days) variation nature of the star, with alternating deep and shallow minima in the light curve, were analysed. As a result of the period analysis of DF Cyg, nearly 30 pulsation frequencies were detected and findings belonging to the second component were noticed. In addition, the echelle spectra obtained for DF Cyg with Sandiford Cassegrain echelle spectrograph and McDonald telescope were used to determine the model parameter and rotational velocity values depending on the pulsation phase of the star using the MCMC method.
Project Number
DOSAP MAP-2020-9749
References
- Alcock C., et al., 1998, AJ, 115, 1921
- Allende Prieto C., 2007, AJ, 134, 1843
- Blanco-Cuaresma S., 2019, MNRAS, 486, 2075
- Bódi A., Szatmáry K., Kiss L. L., 2016, A&A, 596, A24
- Borucki W. J., Koch D. G., Basri G. S., Latham D. W., Howell S. B., 2004, in American Astronomical Society Meeting Abstracts. p.33.05
- Feinstein A. D., et al., 2019, PASP, 131, 094502
- Fokin A. B., 1994, A&A, 292, 133, ADS
- Foreman-Mackey D., Hogg D. W., Lang D., Goodman J., 2013,PASP, 125, 306
- Gehrz R. D., 1972, ApJ, 178, 715
- Gezer I., Van Winckel H., Bozkurt Z., De Smedt K., Kamath D.,Hillen M., Manick R., 2015, MNRAS, 453, 133
- Giridhar S., 2020, Journal of Astrophysics and Astronomy, 41, 44
- Howard A. H., 1989, JAAVSO, 18, 148, ADS
- Jura M., 1986, ApJ, 309, 732
- Kafka S., 2020, in European Planetary Science Congress. ppEPSC2020-314, doi:10.5194/epsc2020-314
- Kiss L. L., Bódi A., 2017, A&A, 608, A99
- Kjeldsen H., Bedding T. R., 1995, A&A, 293, 87, ADS
- Lomb N. R., 1976, Ap&SS, 39, 447
- Manick R., Van Winckel H., Kamath D., Hillen M., Escorza A., 2017,A&A, 597, A129
- Manick R., Van Winckel H., Kamath D., Sekaran S., Kolenberg K.,2018, A&A, 618, A21
- Manick R., et al., 2019, A&A, 628, A40
- Mosser B., et al., 2013, A&A, 559, A137
- Pawlak M., et al., 2019, MNRAS, 487, 5932
- Percy J. R., 2015, JAAVSO, 43, 176, ADS
- Pigulski A., Pojmański G., Pilecki B., Szczygieł D. M., 2009, ActaAstron., 59, 33, ADS
- Pollacco D. L., et al., 2006, PASP, 118, 1407
- Pollard K. R., Cottrell P. L., Kilmartin P. M., Gilmore A. C., 1996,MNRAS, 279, 949
- Preston G. W., Krzeminski W., Smak J., Williams J. A., 1963, ApJ,137, 401
- Ricker G. R., et al., 2014, in Oschmann Jacobus M. J., ClampinM., Fazio G. G., MacEwen H. A., eds, Society of Photo Optical Instrumentation Engineers (SPIE) Conference Series Vol.9143, Space Telescopes and Instrumentation 2014: Optical, Infrared, and Millimeter Wave. p. 914320 (arXiv:1406.0151),doi:10.1117/12.2063489
- Scargle J. D., 1982, ApJ, 263, 835
- Schweitzer E., Vialle J., 1993, Bulletin d’Information du Centre deDonnees Stellaires, 43, 51, ADS
- Stello D., Chaplin W. J., Basu S., Elsworth Y., Bedding T. R., 2009,MNRAS, 400, L80
- Ulrich R. K., 1986, ApJ, 306, L37
- Van Winckel H., 2018, preprint, (arXiv:1809.00871), ADS
- Van Winckel H., Waelkens C., Fernie J. D., Waters L. B. F. M.,1999, A&A, 343, 202, ADS
- Vega L. D., Stassun K. G., Montez Rodolfo J., Boyd P. T., SomersG., 2017, ApJ, 839, 48
- Vega L. D., et al., 2021, ApJ, 909, 138
- Wallerstein G., 2002, PASP, 114, 689
- Yu J., Huber D., Bedding T. R., Stello D., Hon M., Murphy S. J.,Khanna S., 2018, ApJS, 236, 42
- Zsoldos E., 1991, Information Bulletin on Variable Stars, 3557, 1,ADS
- Zsoldos E., 1998, Acta Astron., 48, 775
Details
| Primary Language | Turkish |
|---|---|
| Subjects | Astronomical Sciences (Other) |
| Journal Section | Articles |
| Authors | |
| Project Number | DOSAP MAP-2020-9749 |
| Early Pub Date | July 13, 2023 |
| Publication Date | December 31, 2023 |
| Submission Date | November 5, 2022 |
| Acceptance Date | December 11, 2022 |
| Published in Issue | Year 2023 Volume: 4 Issue: 3 - Special Issue: Proceedings of the 22nd National Astronomy Congress |
TJAA is a publication of Turkish Astronomical Society (TAD).