2016MNRAS.458.1417R

Query : 2016MNRAS.458.1417R

2016MNRAS.458.1417R - Mon. Not. R. Astron. Soc., 458, 1417-1426 (2016/May-2)

A pulsation analysis of K2 observations of the subdwarf B star PG 1142-037 during Campaign 1: A subsynchronously rotating ellipsoidal variable.

REED M.D., BARAN A.S., OSTENSEN R.H., TELTING J.H., KERN J.W., BLOEMEN S., BLAY P., PURSIMO T., KUUTMA T., SLUMSTRUP D., SAAJASTO M., NIELSEN L.D., HARMANEN J., WINANS A.J., FOSTER H.M. and ROWE L.

Abstract (from CDS):

We report a new subdwarf B pulsator, PG 1142-037, discovered during the first full-length campaign of K2, the two-gyro mission of the Kepler space telescope. 14 periodicities have been detected between 0.9 and 2.5 hr with amplitudes below 0.35 parts-per-thousand. We have been able to associate all of the pulsations with low-degree, l <= 2 modes. Follow-up spectroscopy of PG 1142 has revealed it to be in a binary with a period of 0.54 d. Phase-folding the K2 photometry reveals a two-component variation including both Doppler boosting and ellipsoidal deformation. Perhaps the most surprising and interesting result is the detection of an ellipsoidal, tidally distorted variable with no indication of rotationally induced pulsation multiplets. This indicates that the rotation period is longer than 45 d, even though the binary period is near 13 h.

Abstract Copyright: © 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): stars: oscillations - subdwarfs

CDS comments: © 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. Most probably read V1093 Her and V361 Hya (instead of V1093 Hya and V361 Her).

Simbad objects: 5

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Number of rows : 5
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 PG 1142-037 HS* 11 44 57.2433920664 -03 56 53.277278316   15.729 15.897   16.680 sdBO 25 0
2 V* V361 Hya HS* 14 05 33.018072 -27 01 34.01328   15.446 15.258 15.161   sdB+ 129 0
3 PG 1716+426 HS* 17 18 03.8584522800 +42 34 12.562847292   13.69 13.97     sdB2VIIHe3 122 0
4 KPD 1946+4340 HS* 19 47 42.8876526504 +43 47 30.754543092 13.05 14.06 14.23 14.92   sdOB+D 62 0
5 V* EQ Psc HS* 23 34 34.6314973464 -01 19 36.929325288   12.823 12.780 13.556 13.243 sdB 34 0

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