Photometrıc Observatıons of Symbıotıc Star AG PEG
Abstract
In the article, using the AAVSO (American Association of Variable Star Observers) photometric database of the AG Pegasi symbiotic star, a light curve was constructed in the Vis filter for a period of 68 (1954-2022) years. During this period, the brightness of the Ag Peg star changed by approximately 2 magnitudes, reaching from 7.5m to 9.5m. Using the Scargle method, the possible periodicities in the light curve were investigated by applying statistical spectral Fourier analysis. Two P=17857d long and P=815d short periodic variations were detected in the light curve.
Downloads
References
A. Skopal, S. Shugarov, M. Vanko, et al., “Recent photometry of symbiotic stars”, Astronomische Nachrichten, 333, 242-255. (2012). https://doi.org/10.1002/asna.201111655
Kh. M. Mikailov, R. T. Mammadov. “Photometric flickering of the CH Cyg in 2018”, East Europran Journal of Physics, 2, 38-42, (2025). https://periodicals.karazin.ua/eejp/article/view%20/25766/23443
Kh. M. Mikailov, A.J. Orujova, R.T. Mammadov, I.A. Alakbarov, and O.V. Khalilov, “Analysis of spectral and photometric observations of the CH Cyg symbiotic star in 2018,” Astronomıcal Journal of Azerbaıjan, 16(1) 4-21 (2021). https://aaj.shao.az/vol16_n1/AAJ_2021_V16_N1.pdf
Kh. M. Mikailov, and R.T. Mammadov, “95-day variability in the light curve of the symbiotic star CH Cyg,” in: Proceedings of the XXI International Multidisciplinary Conference “Prospects and Key Tendencies of Science in Contemporary World,” (Bubok Publishing S.L., Madrid, 2022), pp. 67-71. https://www.internauka.org/conf/spain/21/343943
W. P. Fleming, “Stars having peculiar spectra”, The Observatory, 56(6), 165-226 (1912). https://adsabs.harvard.edu/full/1912AnHar..56..165F
G. Ramsay, J. L. Sokoloski, G. J. M. Luna, et al. and N.E.Nunez, “Swift observations of the 2015 outburst of AG Peg – from slow nova to classical symbiotic outburst”, Monthly Notices of the Royal Astronomical Society, 461(4), 3599-3606 (2016). https://doi.org/10.1093/mnras/stw1546
S. J. Kenyon, J. Mikolajewska, M. Mikolajewski, R. S. Polidan, & M. H. Slovak, “Evolution of the symbiotic binary system AG Pegasi - The slowest classical nova eruption ever recorded”, Astronomical Journal, 106(4), 1573-1598 (1993).https://articles.adsabs.harvard.edu/full/1993AJ....106.1573K
A. A. Boyarchuk, “The Nature of AG Pegasi”, Soviet Astronomy, 11, 8-15 (1967). https://adsabs.harvard.edu/full/1967SvA....11....8B
D. L. Hutchings and R. O. Redman, “The spectrum of the symbıotıc star AG Pegası 1970-71”, Pub. Astron. Soc. Pacific, 84, 240-247 (1972). https://adsabs.harvard.edu/full/1972PASP...84..240H
S. A. Zhekov & T.V. Tomov, “An XMM–Newton observation of the symbiotic star AG Peg: the X-ray emission after the end of its 2015 outburst” Monthly Notices of the Royal Astronomical Society, 481(4). 5156-5162 (2018). https://doi.org/10.1093/mnras/sty2644
Kh.M. Mikailov, R.T. Mammadov, B.N. Rustamov, and A.B. Rustamova, “Spectral Variability of the Symbiotic Star CH Cyg”. Proceedings of the Pakistan Academy of Sciences: Part A: PS-671, 60(1), 9-13 (2023). https://doi.org/10.53560/PPASA(60-1)671
Kh. M. Mikailov, R.T. Mammadov, I. A. Alakbarov and O. V. Khalilov, “High velocity absorption in the spectra of CH Cyg in 2017”, Astronomıcal Journal of Azerbaıjan, 15(2), 82-90 (2020). https://aaj.shao.az/vol15_n2/AAJ_2020_V15_N2.pdf
T. V. Tomov, K. A. Stoyanov and R. K. Zamanov, “AG Pegasi – now a classical symbiotic star in outburst?”, Monthly Notices of the Royal Astronomical Society, 462(4), 4435-4441 (2016). https://doi.org/10.1093/mnras/stw2012
Kh. M. Mikailov, R.T. Mammadov and I.A. Alakbarov, “750-Days Variability of the CH Cyg ,” Astronomıcal Journal of Azerbaıjan, 16(2) 37-43 (2021). https://aaj.shao.az/vol16_n2/AAJ_2021_V16_N2.pdf#page=36
J. D. Scargle, “Studies in astronomical time series analysis. Fourier transforms. Autocorrelation function and cross-correlation functions of unevenly spaced data”, The Astrophysical Journal, 343, 874-887 (1989). https://articles.adsabs.harvard.edu/pdf/1989ApJ...343..874S
Copyright (c) 2026 Kh. M. Mikailov, R.T. Mammadov, A.B. Rustamova, L.R. Mammadova
This work is licensed under a Creative Commons Attribution 4.0 International License.
Authors who publish with this journal agree to the following terms:
- Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgment of the work's authorship and initial publication in this journal.
- Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgment of its initial publication in this journal.
- Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
