2025RNAAS...9...39P

Query : 2025RNAAS...9...39P

2025RNAAS...9...39P - Research Notes of the AAS, 9, 39 (2025/February-0)

The Eruptive Nature of the Variable Star CzeV195.

PERETTO I., LORA S., SASSARO L., FURLATO G., BARBIERI M., BARBIERI L., LOPRESTI C., QUADRI U., STRABLA L. and MADURINI P.

Abstract (from CDS):

CzeV195 is a variable star discovered by Jaroslav Trnka (CzeV) in 2017 and classified at the Variable Star Index as a suspected EA-type variable star. The SSV-UAI-GRAV research section of the Unione Astrofili Italiani, undertook an observing campaign with ground-based telescopes in 2024 June and July. The star turned out to be an eclipsing variable of the EA type with a period of 0.604905 days. It was possible to detect an oscillation between the primary and secondary minima, typical of chromospherically active stars such as BY Draconis. Thanks to Zwicky Transient Facility and All-Sky Automated Survey for Supernovae photometry, ourbursts typical of UV Cet eruptive stars were detected. Czev195 was ultimately classified after our studies as an EA+BY+UV.

Abstract Copyright: © 2025. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Eclipsing binary stars - Eruptive variable stars - Multi-periodic variable stars - BY Draconis stars - UV Ceti stars

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 V* BY Dra BY* 18 33 55.7720712062 +51 43 08.897780286 10.22 9.23   8.733   K4Ve+K7.5Ve 639 0
2 UCAC4 624-060025 * 18 42 26.114280 +34 46 17.68116       12.267   ~ 1 0
3 UCAC4 624-060044 EB* 18 42 31.5929697535 +34 47 08.512370759       13.539   ~ 2 0
4 TYC 2645-1207-1 * 18 42 33.1447626936 +34 46 31.250046072   13.09 12.59     ~ 1 0

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