2020PASP..132b4201P

Query : 2020PASP..132b4201P

2020PASP..132b4201P - Publ. Astron. Soc. Pac., 132, part no 2, 4201-24201 (2020/February-0)

Newly discovered period changes in two mCP stars and updates for previously published stars.

PYPER D.M. and ADELMAN S.J.

Abstract (from CDS):

We have discovered period decreases for the mCP Si stars 13 And and V913 Sco from analyzing Stromgren uvby observations obtained with the Four College Automated Photometric Telescope at the Fairborn Observatory (FCAPT). We also have incorporated previously unpublished FCAPT data in further analyses of V901 Ori, CS Vir, and EE Dra for which other investigators have reported period changes. We confirm the results for V901 Ori but find no evidence for period change in CS Vir or EE Dra. It is impossible to distinguish between discrete period change models and linear change models for these stars from the available data; this also applies to CU Vir. We discuss some possible causes of this behavior.

Abstract Copyright: © 2020. The Astronomical Society of the Pacific. All rights reserved.

Journal keyword(s):

Simbad objects: 20

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Number of rows : 20
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 * 56 Ari a2* 03 12 14.2461137352 +27 15 25.085668788 5.22 5.64 5.76     B6IV-V 271 0
2 HD 36591 V* 05 32 41.3510096736 -01 35 30.595447356 4.240 5.15 5.34     B1IV 255 0
3 * sig Ori E Y*O 05 38 47.2050040320 -02 35 40.521424812 5.66 6.38 6.46 6.84 7.08 B2IV-Vp_He 486 0
4 V* V901 Ori Ro* 05 40 56.3704617744 -01 30 25.856677224 5.96 6.82 6.96     B2V 354 2
5 HD 40574 * 05 59 37.7488152096 -01 26 38.655818268 6.17 6.56 6.62     B9V 46 0
6 V* CU Vir a2* 14 12 15.8055434051 +02 24 33.945178515 4.46 4.90 5.02 5.10 5.23 ApSi 411 0
7 HD 124683 * 14 15 24.0861905500 -18 12 02.486331960   5.525 5.532     A0V 67 0
8 V* MW Vir EB* 14 17 27.6695787744 -19 57 49.582514880   7.19 6.95   6.649 A5IV 33 0
9 V* CS Vir a2* 14 18 38.2505609712 -18 42 57.465294264 5.86 5.90 5.90     ApSi(Cr) 322 0
10 V* BS Cir a2* 14 23 32.0676955944 -66 38 42.121272156   6.88 6.76     ApSi(Cr) 58 0
11 * 2 Sco ** 15 53 36.71880 -25 19 37.7087 3.86 4.52 4.59     B2.5Vn 169 0
12 HD 142165 SB* 15 53 53.9142283800 -24 31 59.373289920 4.95 5.350 5.372     B5V 146 0
13 V* V913 Sco Ro* 15 58 34.8665694960 -24 49 53.361727284 4.70 5.34 5.43     B5V 226 0
14 V* MN Ser LP* 18 47 32.6241308928 +02 12 05.831660304   15.2       ~ 9 0
15 V* EE Dra a2* 18 58 52.6267962600 +69 31 52.648832568   6.353 6.506     B9III 105 1
16 * 55 Dra * 19 09 45.8058914544 +65 58 42.651598836 6.250 6.260 6.260   6.23 A0V 47 0
17 * pi. Dra * 19 20 40.0914694319 +65 42 52.314729157 4.67 4.61 4.59 4.55 4.58 A0III 103 0
18 * 13 And a2* 23 27 07.4001167376 +42 54 43.235672544   5.726 5.736     B9III 66 0
19 * 15 And dS* 23 34 37.5368337288 +40 14 11.182658856   5.652 5.563 6.91   A1Va 141 0
20 HD 222109 ** 23 37 32.04280 +44 25 44.3723           B8V 76 0

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