2020A&A...639A..23P


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.27CET20:23:24

2020A&A...639A..23P - Astronomy and Astrophysics, volume 639A, 23-23 (2020/7-1)

International observational campaign of the 2014 eclipse of EE Cephei.

PIENKOWSKI D., GALAN C., TOMOV T., GAZEAS K., WYCHUDZKI P., MIKOLAJEWSKI M., KUBICKI D., STAELS B., ZOLA S., PAKONSKA P., DEBSKI B., KUNDERA T., OGLOZA W., DROZDZ M., BARAN A., WINIARSKI M., SIWAK M., DIMITROV D., KJURKCHIEVA D., MARCHEV D., ARMINSKI A., MILLER I., KOLACZKOWSKI Z., MOZDZIERSKI D., ZAHAJKIEWICZ E., BRUS P., PIGULSKI A., SMELA T., CONSEIL E., BOYD D., CONIDIS G.J., PLAUCHU-FRAYN I., HERAS T.A., KARDASIS E., BISKUPSKI M., KNEIP R., HAMBALEK L., PRIBULLA T., KUNDRA E., GARAI Z., RODRIGUEZ D., KAMINSKI T., DUBOIS F., LOGIE L., CAPETILLO BLANCO A., KANKIEWICZ P., SWIERCZYNSKI E., MARTIGNONI M., SERGEY I., KARE TRANDEM QVAM J., SEMKOV E., IBRYAMOV S., PENEVA S., GONZALEZ CARBALLO J.-L., RIBEIRO J., DEAN S., APOSTOLOVSKA G., DONCHEV Z., CORP L., McDONALD P., RODRIGUEZ M., SANCHEZ A., WIERSEMA K., CONSEIL E., MENKE J., SERGEY I. and RICHARDSON N.

Abstract (from CDS):


Context. EE Cep is one of few eclipsing binary systems with a dark, dusty disc around an invisible object similar to ε Aur. The system is characterised by grey and asymmetric eclipses every 5.6yr that have significant variations in their photometric depth, ranging from ∼0.5mag to ∼2.0mag.
Aims. The main aim of the observational campaign of the EE Cep eclipse in 2014 was to test the model of disc precession. We expected that this eclipse would be one of the deepest with a depth of ∼2.0mag.
Methods. We collected multicoloured observations from almost 30 instruments located in Europe and North America. These photometric data cover 243 nights during and around the eclipse. We also analyzed low- and high-resolution spectra from several instruments.
Results. The eclipse was shallow with a depth of 0.710mag in the V band. The multicoloured photometry illustrates small colour changes during the eclipse with a total amplitude of order ~+0.15mag in the B-I colour index. We updated the linear ephemeris for this system by including new times of minima, measured from the three most recent eclipses at epochs E = 9, 10, and 11. We acquired new spectroscopic observations, covering orbital phases around the eclipse, which were not observed in the past and increased the data sample, filling some gaps and giving better insight into the evolution of the Hα and NaI spectral line profiles during the primary eclipse.
Conclusions. The eclipse of EE Cep in 2014 was shallower than expected, measuring 0.710mag instead of ∼2.0mag. This means that our model of disc precession needs revision.

Abstract Copyright: © ESO 2020

Journal keyword(s): binaries: eclipsing - circumstellar matter - stars: emission-line - Be

VizieR on-line data: <Available at CDS (J/A+A/639/A23): tablea29.dat tablea1.dat tablea2p.dat tablea3p.dat tablea9p.dat tablea30.dat sp/* files/*>

Simbad objects: 8

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Number of rows : 8

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 * eps Aur Al* 05 01 58.1290610816 +43 49 23.871349520 3.86 3.53 2.99 2.47 2.02 A9Ia 558 0
2 TYC 2505-672-1 * 09 53 10.0011423144 +33 53 52.759347460   12.51 10.71     ~ 14 0
3 PN M 2-29 PN 18 06 40.9054663929 -26 54 56.372778872   15.24 14.29 15.15 15.905 ~ 122 0
4 TYC 3971-1261-1 * 21 38 59.0891511058 +55 22 16.390869185   10.99 10.67     ~ 1 0
5 NSV 25842 V* 22 09 01.6955836802 +55 45 31.050091773   11.37 11.26 11.31   B8III 10 0
6 BD+55 2690 * 22 09 08.0316761171 +55 47 15.493134885   10.74 10.34     ~ 9 0
7 BD+55 2691 V* 22 09 15.4660346802 +55 44 48.432916022 11.49 11.60 11.19 11.28   B8IV 12 0
8 BD+55 2693 Be* 22 09 22.7549066011 +55 45 24.256335493 10.88 11.1 10.9     B5:nev 73 0

    Equat.    Gal    SGal    Ecl

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2020.10.27-20:23:24

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