2024MNRAS.527.8402K

Query : 2024MNRAS.527.8402K

2024MNRAS.527.8402K - Mon. Not. R. Astron. Soc., 527, 8402-8408 (2024/January-3)

Period variability in the pulsating Extreme Helium stars V652 Her and BX Cir.

KILKENNY D., WORTERS H.L. and BARAN A.S.

Abstract (from CDS):

Eighteen new timings of maxima of the radially pulsating Extreme Helium star, V652 Her, obtained during 2010-2023 are reported, together with 26 new timings of the very similar star, BX Cir, during 2014-2023. New ephemerides are derived from baselines which are now substantially longer than previously published. Both ephemerides are thus refined and, in the case of BX Cir, we find for the first time evidence of a cubic term (the period change rate is decreasing). BX Cir data from the Transiting Exoplanet Survey Satellite (TESS) reveals a previously unreported frequency near 65 μHz (period ∼ 0.179 d) with amplitude ∼0.002 mag.

Abstract Copyright: © 2023 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society.

Journal keyword(s): stars: chemically peculiar - stars: individual: V652 Her, BX Cir - stars: oscillations - stars: variables: general

Simbad objects: 7

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Number of rows : 7
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* DN Leo Pu* 10 38 55.2343433712 +10 03 48.486337812   9.76 9.93     Bp 150 0
2 V* BX Cir Pu* 14 01 36.4829811264 -66 09 56.163698820 11.79 12.62 12.58 12.75   OB+ 69 0
3 V* V821 Cen Pu* 14 14 58.6292612424 -46 17 19.294106424 9.09 9.89 9.98     (B)p 145 0
4 V* V652 Her pA* 16 48 04.6934854032 +13 15 42.420402252   10.31 10.51     ~ 147 0
5 V* NO Ser Pu* 18 03 55.5266289144 -01 00 23.228086608 10.53 10.7 10.3     B 65 0
6 V* PV Tel s?b 18 23 14.6623123440 -56 37 44.138664012 8.60 9.20 9.30     B5?I?pec 130 0
7 V* FQ Aqr Pu* 20 51 21.3360113136 +02 18 46.360439064 9.18 9.62 9.52     F 71 0

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