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The 82nd Name-List of Variable Stars. Part I - RA 0hr to 18hr, Novae and Globular-cluster Variables
Pastukhova, E. N.; Khruslov, A. V.; Samus, N. N. +3 more
We present the first part of a new Name-List of variable stars containing information on 1291 variable stars recently designated in the system of the General Catalogue of Variable Stars. With the exception of Novae and other unusual variables named upon request from the IAU CBAT or by our initiative, these stars are in the range of J2000.0 right a…
New Double Periodic Variable stars in the ASAS-SN Catalog
Mennickent, R. E.; Rosales, J. A.
We report the discovery of 3 new Double Periodic Variables based on the analysis of ASAS-SN light curves: GSD J11630570-510306, V593 Sco and TYC 6939-678-1. These systems have orbital periods between 10 and 20 days and long cycles between 300 and 600 days.
Distance, Luminosity and evolutionary status of epsilon Aurigae (F0Iaep) from Gaia DR2 parallax
Muneer, S.; Parthasarathy, M.
From Gaia DR2 parallax of epsilon Aurigae the distance, Mv, Mbol, and log(L*/LMsun) are found to be 445 parsecs, -6.5 mag, -6.5 mag, and 4.5 respectively. These results clearly indicate that epsilon Aurigae (F0Iae) is post-AGB star. The progenitor of epsilon Aurigae is most likely an intermediate mass star of 4 to 5 solar masses or the progenitor …
A New Variable in the Field of WD1145+017
Serebryanskiy, A.
Revisit of the CCD archive obtained during long-time monitoring of the white dwarf WD1145+015 at Tien-Shan Observatory revealed a new variable star, identified as Gaia DR2 3796400796427214848. It was inferred that this star is of spectral type G7V-G8V. The amount of photometric data allows performing detailed analysis of this target, revealing its…
Revised coordinates of variable stars in Cassiopeia
Nesci, R.
The identification of the variable stars published on IBVS 3573 has ben revised on the basis of the original (unpublished) finding charts. Cross check with the 2MASS catalog has been made to get more accurate coordinates and to confirm their nature from their , colors. The Mira stars, given their known periods, could be used with the astrometric p…
Period Analysis, Roche Modeling and Absolute Parameters for AU Ser, an Overcontact Binary System
Alton, K. B.; Nelson, R. H.; Terrell, D.
CCD photometric data collected at UnderOak Observatory (UO) and Desert Bloom Observatory (DBO) in three bandpasses (B, V and I_C) produced 10 new times of minimum for AU Ser which were used to revise the linear ephemeris. These results captured in 2011 and 2018 reinforced a longstanding observation that the shape of the light curve from this W UMa…
The Status of GSC 3870-01172 as a Member of a Triple or Quadruple System
Nelson, Robert H.; Terrell, D.
New photometry and radial velocities of the eclipsing binary GSC 3870-01172 are reported. Simultaneous analysis of the data using the Direct Distance Estimation method yields the absolute parameters, as well as the distance to the binary. A comparison of the distances and proper motions indicates that the nearby star GSC 3870-01361 may be a third …
TYC 5353-1137-1: an enigmatic Doubly Periodic Variable of semiregular amplitude
Rosales, J. A., Mennickent, R. E.
Revised coordinates of variables in the field of M16-M17
Nesci, R.
The identifications of the variable stars published on IBVS 985 have been checked on the basis of the original finding charts and digitized Asiago plates. Cross check with the 2MASS catalog allowed to get more accurate coordinates. For 19 stars (out of 207) a significant coordinates difference is found and new identifications are given. The interp…
The variable carbon star CGCS 6107
Nesci, R.; Rossi, C.; Ochner, P. +1 more
The spectroscopic and photometric variability of CGCS 6107 has been studied with four telescopes from 2015 to 2018. The star varied between R=11.4 and 14.2 mag with a time scale of 500 days. An appreciable color variation was observed, the star being bluer when brighter. H emission was present around maxima. The spectrum is that of an N type giant…