2025A&A...694A.246A

Query : 2025A&A...694A.246A

2025A&A...694A.246A - Astronomy and Astrophysics, volume 694A246 (2025/2-1)

Searching for new variable white dwarfs: The discovery of the three new pulsating and three new binary systems.

ANTUNES AMARAL L., VUCKOVIC M., PELISOLI I., ISTRATE A., KEPLER S.O. and HIBBERT J.M.

Abstract (from CDS):

In recent years, approximately 150 low-mass white dwarfs (WDs), typically with masses below 0.4 M⊙, have been discovered. Observational evidence indicates that most of these low-mass WDs are in binary systems, supporting binary evolution scenarios as their primary formation pathway. A few extremely low-mass (ELM) WDs in this population have also been found to be pulsationally variable. In this work we present a comprehensive analysis aimed at identifying new variable low-mass WDs. From our candidate selection, 16 objects were identified as being within the ZZ Ceti instability strip. Those objects were observed over multiple nights using high-speed photometry from the SOAR/Goodman and SMARTS-1 m telescopes. Our analysis led to the discovery of three new pulsating WDs: one pulsating ELM WD, one low-mass WD, and one ZZ Ceti star. Additionally, we identified three objects in binary systems, two with ellipsoidal variations in their light curves (one of which is likely a pre-ELM star) and a third that shows a reflection effect.

Abstract Copyright: © The Authors 2025

Journal keyword(s): binaries: general - stars: low-mass - stars: oscillations - white dwarfs

CDS comments: Throughout the article : SDSS J040600.99-542751.7 (GALEX J040600.9-542751), J083013.72-100356.0 (GALEX J083013.7-100356), J083417.21–652423.2 (GALEX J083417.2-652422), J090901.01-454637.0 (DENIS J090901.0-454637), J134619.11-135026.7 (EC 13436-1335), J151626.39-265836.9 (GALEX J151626.3-265836), J183245.52+141311.2 (GALEX J183245.5+141312), and J183702.03-674141.1 (2MASS J18370199-6741412), are erroneous identifiers; these stars are not in any SDSS survey from DR3 to DR16.

Simbad objects: 18

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Number of rows : 18
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 PHL 2737 WD* 00 12 45.5993075448 +14 39 56.409794316           DA 13 0
2 EGGR 166 WD* 00 26 02.2880266968 -10 37 51.863301444   16.483 16.156 16.156   DA4.8 50 0
3 V* ZZ Cet WD* 01 36 13.6153974672 -11 20 32.632874601   14.328 14.16 14.4   DA4.0 307 0
4 GALEX J015958.5-180546 WD* 01 59 58.4991769464 -18 05 46.768888176         17.679 DA 5 0
5 GALEX J040600.9-542751 WD* 04 06 00.9899845560 -54 27 51.690651300           DA 5 1
6 UCAC4 456-007634 El* 04 51 16.8276724225 +01 04 26.600618500   15.849 15.453 15.685   ~ 2 0
7 GALEX J083013.7-100356 * 08 30 13.7175830880 -10 03 56.034643248           ~ 3 1
8 GALEX J083417.2-652422 El* 08 34 17.2066836379 -65 24 23.177021235   17.297 16.754   16.351 ~ 2 1
9 GALEX J090559.6+084324 WD* 09 05 59.6040841848 +08 43 24.878409564           DA 15 0
10 DENIS J090901.0-454637 WD* 09 09 01.0054893960 -45 46 37.019106732         17.047 DA 5 1
11 2QZ J112521.3-023434 WD* 11 25 21.2583215928 -02 34 33.412196388           DA 10 0
12 GALEX J115219.9+024814 WD* 11 52 19.9982073768 +02 48 14.425695216           DA+D 26 0
13 EC 13436-1335 WD* 13 46 19.1061024000 -13 50 26.709806544   16.096 15.807 15.841 15.692 DA5.2 15 1
14 GALEX J151626.3-265836 WD* 15 16 26.3848380360 -26 58 36.937069608         16.782 DA 5 1
15 GALEX J161004.2+063330 WD* 16 10 04.2744129576 +06 33 30.555990900           DA 10 0
16 GALEX J183245.5+141312 EB* 18 32 45.5163006414 +14 13 11.250039455           ~ 2 1
17 2MASS J18370199-6741412 * 18 37 02.0300701204 -67 41 41.097174164         16.540 ~ 3 1
18 PHL 4535 WD* 21 29 35.2295125632 +00 13 32.259559944   15.823 15.521 15.633   DA 24 0

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