2018AJ....156..220L


Query : 2018AJ....156..220L

2018AJ....156..220L - Astron. J., 156, 220-220 (2018/November-0)

Photometric and spectroscopic studies of four new low-mass M-type eclipsing binaries.

LONG L., ZHANG L.-Y., HAN X.L., LU H.-P., PI Q.-F. and YUE Q.

Abstract (from CDS):

We performed multicolor photometric and spectroscopic observations of four new low-mass M-type eclipsing binaries (HAT 225-03429, CRTS J085623.0+282620, CRTS J110302.4+201611, 2MASS J16344899+3716423) in 2017. We obtained new VRI light curves and minimum times of these four systems. Based on our minimum times, we updated the orbital periods and the linear ephemerides using the least squares method. We analyzed these four systems using the Wilson-Devinney program, and obtained the orbital and starspot parameters. The results of our analysis of the light curves indicate that HAT 225-03429 and CRTS J085623.0+282620 are detached eclipsing binaries, CRTS J110302.4+201611 is a semi-detached eclipsing binary, and 2MASS J16344899+3716423 is a contact binary. We performed LAMOST spectroscopic studies of chromospheric activity indicators (Hα, Hβ, Hγ, Hδ, and Ca II H&K lines) for these four systems for the first time. We first determined their spectral types and calculated the equivalent widths of their chromospheric active indicators. These indicators show that the four low-mass M-type eclipsing binaries are active. Furthermore, the radii of these stars are notably larger than model predictions for their masses, except for the secondary component of HAT 225-03429 and the primary component of CRTS J110302.4+201611.

Abstract Copyright: © 2018. The American Astronomical Society. All rights reserved.

Journal keyword(s): binaries: eclipsing - starspots - stars: individual: (HAT 225-03429, individual: CRTS J085623.0+282620, CRTS J110302.4+201611, 2MASS J163)

VizieR on-line data: <Available at CDS (J/AJ/156/220): table1.dat table3.dat>

Simbad objects: 24

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Number of rows : 24
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 2MASS J01542930+0053266 EB* 01 54 29.3039596704 +00 53 26.697572880           M0+M1 17 0
2 NSVS 6507557 EB* 01 58 23.8767983544 +25 21 19.688871456   14.53 12.80     K9+M3 17 0
3 V* BX Tri EB* 02 20 50.850720 +33 20 47.55228   14.86 13.37 12.98 10.98 M2e 45 0
4 NAME SDSS-MEB-1 SB* 03 18 23.8769202096 -01 00 18.413811144         16.91 ~ 24 0
5 2MASS J04463285+1901432 EB* 04 46 32.8622247312 +19 01 43.246330320   19.9 19.0     M 24 0
6 V* V404 CMa EB* 06 15 55.4282293368 -18 44 51.802812672     17.45 16.81   ~ 17 0
7 GSC 03798-01207 EB* 08 44 11.0379487920 +54 23 47.454509940   14.76 13.67 13.36   M 25 0
8 CRTS J085623.0+282620 EB* 08 56 23.0132554584 +28 26 20.768885988     14.36     ~ 3 0
9 CRTS J092128.3+332558 EB* 09 21 28.3484318040 +33 25 58.665840204     14.06     M2 5 0
10 LAMOST J110302.48+201610.9 EB* 11 03 02.4631696416 +20 16 11.247752640     14.72     ~ 4 0
11 FBS 1345+796 EB* 13 45 34.8710774664 +79 23 48.290145432     13.363 13.074   M4/5 40 0
12 V* GU Boo EB* 15 21 54.8243257728 +33 56 09.067285032     13.11     M0/M1.5 91 0
13 CRTS J163448.9+371642 EB* 16 34 48.9997094664 +37 16 42.381365016     14.27     ~ 5 0
14 TYC 458-434-1 EB* 18 30 51.9303 +07 09 18.781   12.73 12.35 12.11   K7V 14 0
15 [DCO2008] T-Lyr1-17236 EB* 19 07 16.6174666272 +46 39 53.151765336   16.110 14.37 14.410   ~ 28 0
16 2MASS J20115132+0337194 EB* 20 11 51.3220884384 +03 37 19.425256500       16.02   ~ 16 0
17 NSVS 5789962 EB? 20 33 36.6614684112 +48 45 30.927221064   12.73 11.76 12.24   ~ 3 0
18 RX J2038.9+5804 EB? 20 38 57.7250342280 +58 04 56.684421228   14.186 13.321 12.910   ~ 4 0
19 BD-22 5866 SB* 22 14 38.3705936256 -21 41 53.188190988   11.72 10.428 10.137 8.606 M0Ve 40 1
20 UCAC4 644-119364 ** 22 49 56.900760 +38 43 48.49428   13.56 12.70 12.59   ~ 7 0
21 NSVS 6127971 EB* 22 49 56.9060719512 +38 43 48.514271556           ~ 7 0
22 V* RT And RS* 23 11 10.0984058784 +53 01 33.031339248   9.58 9.043 8.73   F8V+G0-K1-3V 367 0
23 NSVS 11868841 EB* 23 17 57.5597518968 +19 17 02.788488996     14.084     G9 13 0
24 NSVS 3630887 * 23 55 39.5328340392 +39 12 10.551287484   13.27 12.439     ~ 3 0

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2022.10.08-01:27:13

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