2018MNRAS.478..867P

Query : 2018MNRAS.478..867P

2018MNRAS.478..867P - Mon. Not. R. Astron. Soc., 478, 867-884 (2018/July-3)

The sdA problem - II. Photometric and spectroscopic follow-up.

PELISOLI I., KEPLER S.O., KOESTER D., CASTANHEIRA B.G., ROMERO A.D. and FRAGA L.

Abstract (from CDS):

The spectral classification 'subdwarf A' (sdA) is given to stars showing H-rich spectra and sub-main-sequence surface gravities, but effective temperature lower than the zero-age horizontal branch. Their evolutionary origin is an enigma. In this work, we discuss the results of follow-up observations of selected sdAs. We obtained time-resolved spectroscopy for 24 objects and time-series photometry for another 19 objects. For two targets, we report both spectroscopy and photometry observations. We confirm seven objects to be new extremely low-mass white dwarfs (ELMs), one of which is a known eclipsing star. We also find the eighth member of the pulsating ELM class.

Abstract Copyright: © 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): subdwarfs - binaries: general - stars: evolution - white dwarfs

Status at CDS : Large table(s) will be appraised for possible ingestion in VizieR.

Simbad objects: 45

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Number of rows : 45
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 SDSS J004227.73-010634.9 SB* 00 42 27.7322072040 -01 06 34.954227144           ELMD? 4 0
2 SDSS J011508.65+005346.0 SB* 01 15 08.6517321552 +00 53 46.075044804           ELMD? 5 0
3 [CWH2004] CSA94-043 HB* 02 49 32.8485229416 -01 07 08.540725800           A0 5 0
4 US 3652 SB* 03 06 08.9268938835 -00 13 38.920831631           sdA 7 0
5 HE 0326+0023 WD* 03 29 14.7729103608 +00 33 21.894210900           ELMD 7 0
6 SDSS J045001.34-042712.9 * 04 50 01.3419177552 -04 27 12.987330840           A0 1 0
7 2MASS J04551499-0432310 SB* 04 55 15.0035985744 -04 32 31.022093652           ELMD? 6 0
8 SDSS J073934.37+172225.5 SB* 07 39 34.3805478144 +17 22 25.548724920           ELMD 3 0
9 GALEX J073958.5+175835 HS* 07 39 58.5808051152 +17 58 34.426112952           sdB1He0+G/K 13 0
10 GALEX J075133.4+101809 HS* 07 51 33.4872489096 +10 18 09.473094972           sdA 8 0
11 ZTF J075519.92+091510.9 RR* 07 55 19.9259738736 +09 15 11.049372792           A0 9 0
12 SDSS J075738.94+144827.5 HB* 07 57 38.9397389976 +14 48 27.538650108           A0 3 0
13 2MASS J08403482+0453572 SB* 08 40 34.8331424616 +04 53 57.588577404           ELMD 3 0
14 SDSS J090410.00+034332.9 * 09 04 10.0025301888 +03 43 33.042816696           A0 3 0
15 LINEAR 6679895 SB* 09 20 56.0962123488 +01 31 14.830334364     16.43     ELMD 10 0
16 GALEX J092140.3+004347 HS* 09 21 40.3755553224 +00 43 48.004479804           sdB 10 0
17 SDSS J094144.89+001233.8 HB* 09 41 44.8945412712 +00 12 33.867782568           A4V 3 0
18 SDSS J101701.89+070806.8 BS* 10 17 01.8959470272 +07 08 06.793802052           A0 3 0
19 SDSS J104522.80-023735.6 * 10 45 22.8058877472 -02 37 35.715640296   19.61       sdA 4 0
20 UCAC4 370-060166 * 11 03 38.4551980992 -16 06 17.414575056   16.050 15.790 16.106   A0 1 0
21 SDSS J111041.50+132354.3 * 11 10 41.5012673520 +13 23 54.348811296           sdA 2 0
22 SDSS J112058.97+042012.4 * 11 20 58.9719412200 +04 20 12.413369544           sd 6 0
23 SDSS J112616.66-010140.7 * 11 26 16.6701978408 -01 01 40.756074600           A0 3 0
24 SDSS J112620.47+090145.5 * 11 26 20.4791664168 +09 01 45.555730572           A0 3 0
25 2QZ J122911.5-003815 SB* 12 29 11.5028350440 -00 38 14.499864456           ELMD? 6 0
26 UCAC4 493-060690 SB* 13 43 36.4428788184 +08 26 39.423219108   16.553 16.295     ELMD 7 0
27 UCAC4 534-054470 * 14 03 53.3391726264 +16 42 08.190560844   16.397 16.044 16.134   A0 3 0
28 SDSS J142421.30-021425.4 BS* 14 24 21.3053189856 -02 14 25.439968140           ELMD 6 0
29 SDSS J143333.45+041000.8 BS* 14 33 33.4619116680 +04 10 00.800709204   17.7   18.5   A0 4 0
30 SDSS J155937.48+113721.9 * 15 59 37.4815703952 +11 37 21.946670796           A0 1 0
31 UCAC4 503-062651 * 16 00 40.9530595920 +10 25 11.809396056   15.239 15.003 14.963   A0 2 0
32 GALEX J162624.9+162202 HS* 16 26 24.9185695800 +16 22 01.470885996           sdB 12 0
33 2MASS J16362507+1133126 * 16 36 25.0825750296 +11 33 12.545629632           sdA 3 0
34 UCAC4 516-064018 * 16 57 00.8971242720 +13 07 59.558648232   15.837 15.695 16.034   A0 2 0
35 UCAC4 386-143718 * 20 17 57.2932204824 -12 56 15.677936592           A0 1 0
36 2MASS J20403841-0102156 * 20 40 38.4113914824 -01 02 15.679782348           A0 2 0
37 2MASS J20512069+0145546 SB* 20 51 20.6792752968 +01 45 54.477805248           ELMD 2 0
38 GALEX J213428.5-011409 HS* 21 34 28.6331704752 -01 14 09.379374180           sdB 6 0
39 GALEX J222009.7-092709 HS* 22 20 09.7446827136 -09 27 09.861030828   16.042 15.893 16.201   sdB+? 8 0
40 SDSS J223831.91+125318.3 HB* 22 38 31.9119933096 +12 53 18.320854596           sdA 4 0
41 SDSS J233343.95-001502.0 * 23 33 43.9551268416 -00 15 02.041365348           A0 2 0
42 2MASS J23340321+1538292 * 23 34 03.2175424608 +15 38 29.192317692           A0 6 0
43 SDSS J233606.14-102551.5 SB* 23 36 06.1375301472 -10 25 51.546829512           ELMD? 4 0
44 2MASS J23362593+1502596 * 23 36 25.9262844816 +15 02 59.605637028           A0 2 0
45 SDSS J233708.62-094307.0 HB* 23 37 08.6234894472 -09 43 06.985220376           sdA 5 0

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