Results 31 to 40 of about 5,702,760 (334)

Development of a Period Analysis Algorithm for Detecting Variable Stars in Time-Series Observational Data

Journal of Astronomy and Space Sciences, 2019
The purpose of this study was to develop a period analysis algorithm for detecting new variable stars in the time-series data observed by charge coupled device (CCD). We used the data from a variable star monitoring program of the CBNUO.
Kim, Dong-Heun, Kim, Yonggi, Yoon, Joh-Na, Im, Hong-Seo   +3 more
doaj   +1 more source

SN 2015bh: NGC 2770's 4th supernova or a luminous blue variable on its way to a Wolf-Rayet star? [PDF]

, 2016
Very massive stars in the final phases of their lives often show unpredictable outbursts that can mimic supernovae, so-called, "SN impostors", but the distinction is not always straigthforward.
C. Thöne, A. D. U. Postigo, A. D. U. Postigo, G. Leloudas, G. Leloudas, C. Gall, C. Gall, Z. Cano, Z. Cano, Keiichi Maeda, Keiichi Maeda, S. Schulze, S. Schulze, S. Schulze, S. Campana, K. Wiersema, J. Groh, J. D. L. Rosa, F. E. Bauer, F. E. Bauer, F. E. Bauer, D. Malesani, D. Malesani, J. Maund, N. Morrell, Y. Beletsky   +25 more
semanticscholar   +1 more source

Variability and star formation in Leo T, the lowest luminosity star-forming galaxy known today [PDF]

, 2012
We present results from the first combined study of variable stars and star formation history (SFH) of the Milky Way (MW) "ultra-faint" dwarf (UFD) galaxy Leo T, based on F606W and F814W multi-epoch archive observations obtained with the Wide Field ...
Barning, Bell, Belokurov, Belokurov, Benedict, Bovill, Bovill, Brown, Bullock, Caputo, Castellani, Cignoni, Clementini, Clementini, Clementini, Clementini, Coté, Dall'Ora, Dall'Ora, de Jong, De Propris, Di Criscienzo, Diemand, Dolphin, Dolphin, Ferguson, Gisella Clementini, Grcevich, Greco, Hidalgo, Hidalgo, Hurley-Keller, Ibata, Ilaria Musella, Irwin, Kirby, Kirby, Koposov, Kuehn, Law, Luciana Federici, Mackey, Mackey, Marcella Marconi, Michele Cignoni, Monica Tosi, Moretti, Musella, Musella, Muñoz, Oosterhoff, Plummer, Richardson, Rocha, Rodrigo Contreras Ramos, Schlegel, Simon, Skillman, Slater, Tumlinson, Vincenzo Ripepi, Weisz, Weisz   +62 more
core   +2 more sources

The Herschel view of the nebula around the luminous blue variable star AG Carinae [PDF]

, 2015
Far-infrared Herschel PACS imaging and spectroscopic observations of the nebula around the luminous blue variable (LBV) star AG Car have been obtained along with optical imaging in the Hα+[N ii] filter.
C. Vamvatira-Nakou, D. Hutsemékers, P. Royer, N. Cox, Y. Nazé, G. Rauw, C. Waelkens, M. Groenewegen   +7 more
semanticscholar   +1 more source

SOME EUROPEAN VARIABLE STAR OBSERVERS ORGANIZATIONS

Odessa Astronomical Publications, 2017
A subjective description and comparison of four groups of variable stars observers.
A. Paschke
doaj   +1 more source

Current stage of studies of the star configurations at intermediate energies with the use of the BINA detector

SciPost Physics Proceedings, 2020
The Space Star Anomaly in proton-deuteron breakup cross-section occurs at energies of about 10 MeV. Data for higher energies are sparse. Therefore, a systematic scan over star configurations in the range of intermediate energies between 50 and 100 MeV ...
A. Wilczek, A. Szadzinski, K. Bodek, I. Ciepal, M. Eslami-Kalantari, N. Kalantar-Nayestanaki, G. Khatri, St. Kistryn, B. Klos, A. Kozela, J. Kubos, P. Kulessa, A. Lobejko, A. Magiera, H. Mardanpour, J. Messchendorp, I. Mazumdar, W. Parol, A. Ramazani-Moghaddam-Aran, R. Ramazani-Sharifabadi, D. Rozpedzik, I. Skwira-Chalot, E. Stephan, B. Wloch, A. Wronska, J. Zejma
doaj   +1 more source

Multifilter Time-series Observations of Eleven Blue Short-period ATLAS Variable Stars

The Astronomical Journal, 2023
Eleven periodic variable stars were observed photometrically through two to four filters from the set UBVR _C I _C . Phase-folded data for each star cover full cycles of variation.
C. Koen, V. Schaffenroth, A. Kniazev
doaj   +1 more source

Long-period variable stars in NGC 147 and NGC 185 – I. Their star formation histories [PDF]

, 2016
NGC 147 and NGC 185 are two of the most massive satellites of the Andromeda galaxy (M 31). Close together in the sky, of similar mass and morphological type dE, they possess different amounts of interstellar gas and tidal distortion.
R. H. Golshan, A. Javadi, J. V. Loon, H. Khosroshahi, E. Saremi   +4 more
semanticscholar   +1 more source

BD +20°1171 - LONG - PERIODIC VARIABLE STAR

Odessa Astronomical Publications, 2017
BD +20°1171 (= NSV 16732 = TYCHO 1320 91 1 = HD 39785 = SAO 077726) is a long-periodic pulsating variable star of SRc-type with a period of 20930d , range of variations in B 8.m8 - 10.m3, and the most realiable maximum is JD 2443410 ...
I. S. Brukhanov
doaj   +1 more source

Discovering New Variable Stars at Key Stage 3 [PDF]

, 2017
Details of the London pilot of the `Discovery Project' are presented, where university-based astronomers were given the chance to pass on some real and applied knowledge of astronomy to a group of selected secondary school pupils.
Chubb, Katy, Holdship, Jonathan, Hood, Rosie, Hutton, Sarah, Wilson, Thomas   +4 more
core   +2 more sources