2025PASJ...77..754N

Query : 2025PASJ...77..754N

2025PASJ...77..754N - Publ. Astron. Soc. Jap., 77, 754-767 (2025/April-0)

Most active Algol-type system U Cephei: Drastic variations in the light curves obtained with the Transiting Exoplanet Survey Satellite.

NARUSAWA S.-Y., NAGAI K., MAEHARA H. and YADA T.

Abstract (from CDS):

The most active Algol-type binary system, U Cephei, is well known for photometric disturbances. The large, rapid changes occurring in the light curves of out of the primary eclipse have been attributed to a cool spot on the primary star. We have studied the continuous light curves obtained with the Transiting Exoplanet Survey Satellite (TESS) and have found drastic disturbances, including many non-periodic “humps” and “dips” of various sizes. These cannot be explained by cool spots but rather by complex circumstellar matter (and related regions). By examining continuous data, we correlated light anomalies with circumstellar structures.

Abstract Copyright: © The Author(s) 2025. Published by Oxford University Press on behalf of the Astronomical Society of Japan.

Journal keyword(s): binaries: close - binaries: eclipsing - circumstellar matter - stars: individual (U Cephei)

Simbad objects: 11

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Number of rows : 11
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 HD 3440 PM* 00 39 47.2501746408 +82 29 37.546148904   6.935 6.389     F9V 66 0
2 HD 5679 SB* 01 02 18.4439850768 +81 52 32.081564352   6.92 6.92     G2III:+B8/9 476 0
3 V* RZ Cas SB* 02 48 55.5102370536 +69 38 03.441502644   6.40 6.26     A3V 471 0
4 V* RW Tau Be* 04 03 54.3161404416 +28 07 33.494136636   8.130 8.08 8.76   B8Ve+K0IV 270 0
5 HD 45910 Be* 06 30 32.9373877056 +05 52 01.204796244 6.64 7.18 6.85 6.31 5.81 B2IIIe 234 0
6 V* RY Gem SB* 07 27 24.1728227544 +15 39 34.699185396   8.88 8.68     A0V:e+K0II 151 0
7 V* U CrB SB* 15 18 11.3524167096 +31 38 49.412401368   7.79 7.83     B6V 267 0
8 V* W Ser SB* 18 09 50.6485613712 -15 33 00.263398644   9.64 8.42     F8/G2Iaep(+A) 143 0
9 * U Sge SB* 19 18 48.4082723376 +19 36 37.722978540 6.23 6.61 6.58     B7III+K1III 385 0
10 HD 187399 SB* 19 48 41.8753472328 +29 24 08.388690624 6.92 7.38 7.12 6.82 6.66 B7Ia?e 111 0
11 V* SW Cyg SB* 20 06 57.9309043632 +46 17 58.151017284   9.57 9.35     A2 172 0

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