2020JAVSO..48..162P

Query : 2020JAVSO..48..162P

2020JAVSO..48..162P - J. Am. Assoc. Variable star obs., 48, 162 (2020/June-0)

V725 Sagittarii: Unique, Important, Neglected.

PERCY J.R.

Abstract (from CDS):

During the last century, V725 Sgr gradually changed from a 12-day Cepheid to an 85-day yellow semiregular giant. This paper presents wavelet analysis of AAVSO visual observations from 1982 to 2020, and Fourier analysis of ASAS-SN observations from 2016 to 2018. The results confirm that the previously-identified pulsation period has increased from about 50-60 days to 80-90 days since 1982. In the ASAS-SN data, there appear to be both a 82.6-day period and a possible 160.0-day period, though the latter is not prominent after pre-whitening. If it is real, however, the two periods could be interpreted as a first overtone period and a fundamental period, respectively. Evidence for two (or more) periods can also be seen in the ASAS-SN light curve, and in the visual data. The total V range is 1.1 magnitude. Since recent results in the literature indicate that V725 Sgr is a K4 yellow giant, it should be classified as a SRd variable. In view of its continuing changes, it needs and deserves to be monitored more systematically.

Journal keyword(s): stars - stars: late-type - techniques: photometric - methods: statistical - stars: variable - stars: oscillations

Status at CDS : Objects in title, abstract, text, figures, and all or part of small table(s) being processed in SIMBAD.

Simbad objects: 1

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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	V* V725 Sgr	LP*	18 11 59.4391917456	-36 06 40.335553692						~	16	0

Query : 2020JAVSO..48..162P

Basic data :

V* V725 Sgr -- Long-Period Variable

V* (AN,V*,...), cC* (2018yCat), LP* (2022yCat), * (Gaia), NIR (2MASS)

18 11 59.4391917456 -36 06 40.335553692 (Optical) [ 0.0259 0.0224 90 ] A 2020yCat.1350....0G

18 08 36.9517618145 -36 07 25.135000135 [ 0.0259 0.0224 90 ]

356.4948308585361 -08.3715218089373 [ 0.0259 0.0224 90 ]

-1.231 -4.341 [0.031 0.023 90] A 2020yCat.1350....0G

0.1615 [0.0328] A 2020yCat.1350....0G

G 11.795985 [0.021609] C 2020yCat.1350....0G

J 9.792 [0.030] C 2003yCat.2246....0C

H 9.121 [0.033] C 2003yCat.2246....0C

K 8.923 [0.029] C 2003yCat.2246....0C

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*`SV HV 7642`**	`2MASS J18115943-3606402`	*`V V725 Sgr`**	`Gaia DR3 4038015379997952512`
`AN 419.1937`	`TIC 332190173`	`AAVSO 1805-36`	`Gaia DR2 4038015379997952512`

References (16 between 1850 and 2026) (Total 16)
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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2MASS J18115943-3606402 V* V725 Sgr Gaia DR3 4038015379997952512 Gaia DR2 4038015379997952512

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