Search Publications
DeGaPe 35: Amateur discovery of a new southern symbiotic star
Charbonnel, Stéphane; Garde, Olivier; Merc, Jaroslav +6 more
In this work, we present the discovery and characterization of a new southern S-type symbiotic star, DeGaPe 35. We have obtained the low-resolution spectroscopic observations and supplemented them with the photometry from Gaia DR3 and other surveys. The optical spectra of this target show prominent emission lines, including highly ionized [Fe VII]…
Spectroscopic and photometric study of the pulsating eclipsing binary HIP 28271
Chen, Tao; Wang, Kun; Cao, Xingmei
We report the results of the detailed study of the single-lined eclipsing binary HIP 28271 with time-series high-resolution spectra and high-precision TESS photometry. The binary modeling indicates that HIP 28271 has a short orbital period of 2.7404254-4e-7+9e-7 days, with an eccentricity ofeorb = 0.0062-0.001…
New photometric solutions of contact binaries HX UMa and FP Boo
Yıldırım, M. F.
By using different databases (TESS, SuperWASP, KWS and ASAS-SN), light curve analyzes of HX UMa and FP Boo systems were performed, and the changes in the orbital period of the systems were also examined. The light curve analyzes of the systems were conducted simultaneously with the radial velocities using the Wilson and Devinney (WD) code. As a re…
Revisiting the orbital motion of WR 138
Nazé, Yaël; Gosset, Eric; Rauw, Gregor
The optical spectrum of WR 138 exhibits emission lines typical of a WN6o star and absorption lines from a rapidly-rotating OB star. Using a large set of spectroscopic data, we establish a new orbital solution of the WN6o star based on the radial velocities of highly-ionized nitrogen lines. We show that the WN6o star moves on a 4.3 yr orbit with a …
HD 32239: An Algol type eclipsing binary with a γ Doradus type component
Gürol, Birol
HD 32239 is an Algol-type eclipsing binary with one of the components showing γ Doradus type pulsation. In this study by using the Transiting Exoplanet Survey Satellite (TESS) observations of the HD 32239 system published in Sectors 5 and 32, we obtained the minima times of the eclipsing system and calculated the new light elements by using the (O…
OT UMa and 2MASS J09251388+6424488: Two active contact eclipsing binary systems
Dong, A. -J.; Zhang, B.; Mei, K. -Y. +2 more
In this paper, new photometric light curves (LCs) of OT UMa and 2MASS J09251388+6424488 (=NSVS 2497620, hereafter NSVS 2497) in BVRcIc -bands are presented and analyzed by using the 2015 version of the Wilson-Devinney (W-D) code. We found that both of them are active contact eclipsing binaries (CEBs) . At the same time, we es…
A Gaia based analysis of open cluster Berkeley 27
Bisht, D.; Yadav, R. K. S.; Rangwal, G. +2 more
In this paper, we have used the Gaia's Data Release-3 (DR3) data to study an intermediate-age open cluster Berkeley 27 (Be 27). A total of 131 most probable cluster members are picked within the cluster's radius based on the membership probability (> 80%). The cluster's radius was estimated as 3.74 arcmin. The mean proper motion (PM) of Be 27 w…
Photometric study of the overcontact binary V826 Aur
Tobin, R. Wes; Berrington, Robert C.
We present BVRC differential photometry of an eclipsing binary system V826 Aur. A period analysis shows near constant period of 0.36 days across two decades of observation. The best fit models are consistent with a W-type W UMa overcontact binary consisting of a less massive G8 primary star and a more massive K0 secondary star. The mode…
The first photometric and spectroscopic analysis of the neglected totally eclipsing contact binary NSVS 2536063
Wang, Xi; Li, Kai; Xia, Qi-Qi +4 more
We firstly studied the neglected totally eclipsing contact binary NSVS 2536063 using the newly observed g'r'i' light curves of 60 cm Ningbo Bureau of Education and Xinjiang Observatory Telescope (NEXT) and some public data, which come from the Transiting Exoplanet Survey Satellite (TESS), the All-Sky Automated Surv…
Wray 15-811: An unusual runaway star
Gamen, R.; Di Mille, F.; Gramajo, L. +4 more
We investigate Wray 15-811, a poorly studied object of controversial nature. We present for the first time spectroscopic observations (at low, medium, and high resolution), together with deep narrow-band images. These original data are combined with data from public surveys, to infer the nature of this object.
We conclude that Wray 15-811 is …