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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The identification of the variable stars published on IBVS 3573 has ben revised on the basis of the original (unpublished) finding charts.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…
Revised coordinates of 3 variable stars in Cygnus
Nesci, R.
The identification of the variable stars published on IBVS 1302 has ben checked on the basis of the original (unpublished) finding charts. For 3 stars significant differences were found and are reported here to allow an easier recovery by automatic cross-check procedures using digital catalogs. Some data from the recent Gaia DR2 catalog are also g…