2023RNAAS...7..255K

Query : 2023RNAAS...7..255K

2023RNAAS...7..255K - Research Notes of the AAS, 7, 255 (2023/November-0)

Pulsational Velocity Variations of the Radial Mode sdBV Star BPM 36430.

KIRBY B.C., SMITH B.A. and BARLOW B.N.

Abstract (from CDS):

Hot subdwarf B stars are core-helium burning objects that were once red giants stripped of their outer H envelopes due to binary interactions. Many exhibit pulsations that can be used to determine fundamental stellar parameters like mass and radius. High-cadence TESS photometry of the sdB star BPM 36430 revealed it to be a hybrid-mode pulsator showing several g-mode pulsations and a single strong p-mode oscillation. The latter is likely a radial mode oscillation, given its period (342 s) and high photometric amplitude (2%). Using time-series spectroscopy from the Goodman spectrograph on the 4.1 m SOAR telescope, we detect a sinusoidal radial velocity variation with a semi-amplitude of 4.4 ± 0.4 km s^–1 and period consistent with photometry of the p-mode oscillation. This detection provides further evidence the 342 s mode is radial in nature, and that the Baade-Wesselink method can be used with additional observations to constrain the stellar mass and radius.

Journal keyword(s): Radial pulsations - Stellar pulsations - Radial velocity - B subdwarf stars - Extreme horizontal branch stars

Simbad objects: 1

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Number of rows : 1

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	L 325-214	WD*	11 56 11.4296676576	-48 40 03.330239592		12.65	12.86			DA	26	0

Query : 2023RNAAS...7..255K

Basic data :

L 325-214 -- White Dwarf

* (2021MNRAS,BPM,...), WD* (1977MNRAS,WD), blu (2019A&A), HS? (2019A&A), PM* (2018yCat), UV (GALEX), NIR (2MASS)

11 56 11.4296676576 -48 40 03.330239592 (Optical) [ 0.0218 0.0226 90 ] A 2020yCat.1350....0G

11 53 39.6440607943 -48 23 21.840342371 [ 0.0218 0.0226 90 ]

293.6120288674060 +13.2018455011167 [ 0.0218 0.0226 90 ]

-57.753 14.933 [0.034 0.030 90] A 2020yCat.1350....0G

1.8423 [0.0382] A 2020yCat.1350....0G

DA D 1979PASP...91..492H

B 12.65 [~] E ~

V 12.86 [~] E ~

G 12.842434 [0.002836] C 2020yCat.1350....0G

J 13.412 [0.024] C 2003yCat.2246....0C

H 13.477 [0.025] C 2003yCat.2246....0C

K 13.516 [0.045] C 2003yCat.2246....0C

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`WD 1153-484`	`GALEX J115611.3-484003`	`2MASS J11561142-4840031`	`uvby98 600236430`
`BPM 36430`	`GEN# +6.00236430`	`TIC 273218137`	`Gaia DR2 5371215147518355328`
`GALAH 170507007201131`	`L 325-214`	`UCAC2 10852635`	`Gaia DR3 5371215147518355328`

References (26 between 1850 and 2026) (Total 26)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).

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`WD 1153-484`	`GALAH 170507007201131`	`GALEX J115611.3-484003`	`2MASS J11561142-4840031`	`UCAC2 10852635`
`uvby98 600236430`	`Gaia DR2 5371215147518355328`	`Gaia DR3 5371215147518355328`

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