2022RNAAS...6..253M

Query : 2022RNAAS...6..253M

2022RNAAS...6..253M - Research Notes of the AAS, 6, 253 (2022/December-0)

Gaia22eor: Symbiotic Star V2756 Sgr Detected in a Deep Eclipse.

MERC J., BARKER H. and GALIS R.

Abstract (from CDS):

V2756 Sgr is a long-known S-type symbiotic binary that was recently detected in ∼1 mag eclipse-like fading by the Gaia satellite. This behavior was reported as a Gaia Science Alert under the designation Gaia22eor. V2756 Sgr has not been reported as an eclipsing symbiotic system. In this contribution, we have investigated the recent light curves of this target obtained by Gaia and ASAS-SN survey and supplemented these data by the photometry from the ASAS survey and DASCH archive. In addition, low-resolution BP/RP spectra from Gaia were examined. Based on the presented analysis, we conclude that the observed fading is indeed an eclipse of the hot component of V2756 Sgr by the cool giant. The data also allowed us to refine the orbital period to 725 ± 3 days.

Journal keyword(s): Symbiotic binary stars - Eclipsing binary stars - Photometry - Gaia

Simbad objects: 1

Full paper

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Number of rows : 1

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	EM* AS 293	Sy*	18 14 34.5215163454	-29 49 23.854464153		11	12.70			M2/3e	47	1

Query : 2022RNAAS...6..253M

Basic data :

EM* AS 293 -- Symbiotic Star

PN (Hen,PK,...), Em* (EM*,SS73), V* (V*,AAVSO), ev (AT,Gaia), Sy* (1984PASAu), LP? (2022yCat), G (ESO), * (Gaia), EmO (MHA), NIR (2MASS)

18 14 34.5215163454 -29 49 23.854464153 (Optical) [ 0.0298 0.0251 90 ] A 2020yCat.1350....0G

18 11 22.5011804297 -29 50 20.250719731 [ 0.0298 0.0251 90 ]

002.3558963314021 -05.9187053858978 [ 0.0298 0.0251 90 ]

-4.660 -5.978 [0.036 0.026 90] A 2020yCat.1350....0G

0.0871 [0.0345] A 2020yCat.1350....0G

M2/3e D 1983RMxAA...8...39M

B 11 [~] E ~

V 12.70 [~] E ~

G 12.170238 [0.012362] C 2022yCat.1355....0G

J 9.193 [0.026] C 2003yCat.2246....0C

H 8.284 [0.033] C 2003yCat.2246....0C

K 7.890 [0.018] C 2003yCat.2246....0C

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`2MASS J18143452-2949237`	`Hen 2-370`	`TIC 377710555`	`Gaia 22eor`
`AT 2022aagn`	`MHA 304-122`	*`V V2756 Sgr`**	`Gaia DR3 4049689204148424832`
*`EM AS 293`**	`PK 002-05 1`	`WRAY 16-392`
`ESO 456-79`	`SS73 145`	`AAVSO 1808-29B`

References (47 between 1850 and 2026) (Total 47)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).

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External archives :

Data at NED - NASA/IPAC Extragalactic Database : EM* AS 293

Link by name to the catalogue in VizieR :

2MASS J18143452-2949237 V* V2756 Sgr Gaia DR3 4049689204148424832

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