2021JAVSO..49....2R

Query : 2021JAVSO..49....2R

2021JAVSO..49....2R - J. Am. Assoc. Variable star obs., 49, 2 (2021)

Low Resolution Spectroscopy of Miras 2–R Octantis.

REA B. and MARTIN J.C.

Abstract (from CDS):

Low resolution spectroscopy with a filter wheel grating (R ∼ 50-200) is an effective tool to monitor Mira type variables around their cycle. In early type Mira variables changes in spectral type are reflected in the depth of TiO absorption bands relative to nearby quasi-continuum points. However, those indices lose sensitivity in spectral types later/cooler than M6 or M7. Flux ratios between quasi-continuum points are better suited to monitor a cooler Mira like R Oct at low spectral resolution through its entire cycle. We identify flux ratios between quasi-continuum points in low resolution spectra that are sensitive enough to distinguish between comparison stars of different spectral types and find cycle-to-cycle differences in the behavior of R Oct around peak brightness. Those ratios are also much more sensitive than TiO to changes from mid to minimum in the cycle even when rendered less effective by lower signal to noise levels when R Oct approached minimum brightness.

Abstract Copyright: ∼

Journal keyword(s):

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* R Oct Mi* 05 26 06.1935907128 -86 23 17.758587372   10.23 6.40     M5.5e 95 0

Query : 2021JAVSO..49....2R

Basic data :
V* R Oct -- Mira Variable
Other object types: otypes_help 		* (HD,CD,...), V* (ASAS,V*,...), IR (DIRBE,IRAS), Mi* (2017ARep), LP* (2022yCat), LP? (2018A&A), NIR (2MASS)
ICRS coord. (ep=J2000) : 		05 26 06.1935907128 -86 23 17.758587372 (Optical) [ 0.0768 0.0980 90 ] A 2020yCat.1350....0G
FK4 coord. (ep=B1950 eq=1950) : 		05 41 09.3969890857 -86 25 14.591269396 [ 0.0768 0.0980 90 ]
Gal coord. (ep=J2000) : 		299.1074323887007 -28.3902446826954 [ 0.0768 0.0980 90 ]
Proper motions mas/yr : 		0.540 31.079 [0.105 0.117 90] A 2020yCat.1350....0G
Radial velocity / Redshift / cz : 		V(km/s) 46.00 [4.7] / z(~) 0.000153 [0.000016] / cz 46.00 [4.70]
   C 2006AstL...32..759G
Parallaxes (mas): 		1.7152 [0.0862] A 2020yCat.1350....0G
Spectral type: 		M5.5e B 1966ApJS...13..333K
Fluxes (6) :
B 10.23 [~] E ~
V 6.40 [~] C 2002yCat.2237....0D
G 7.593839 [0.033546] C 2022yCat.1355....0G
J 1.78 [~] C 2002yCat.2237....0D
H 0.87 [~] C 2002yCat.2237....0D
K 0.45 [~] C 2002yCat.2237....0D
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Identifiers (23) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

HD 40857 GCRV 3552 2MASS J05260609-8623179 V* R Oct
ASAS J052606-8623.3 GEN# +1.00040857 PPM 376550 WEB 4925
CD-86 52 GSC 09500-00047 SKY# 8651 AAVSO 0556-86
CPC 22 700 HIC 25412 SV* HV 18 Gaia DR3 4613972663311070208
CPD-86 72 HIP 25412 TIC 410417579 Gaia DR2 4613972663311070208
DIRBE D05260609M8623179 IRAS 05411-8625 TYC 9500-47-1

References (95 between 1850 and 2026) (Total 95)
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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Collections of Measurements Description of Measurements

Velocities : 5    Distance : 2    Var : 5    Plx : 4    PM : 4    SpT : 2   

   

External archives :

Data at NED - NASA/IPAC Extragalactic Database : V* R Oct

Link by name to the catalogue in VizieR :

HD 40857 CD-86 52 CPD-86 72 GSC 09500-00047 HIC 25412
HIP 25412 IRAS 05411-8625 2MASS J05260609-8623179 PPM 376550 TYC 9500-47-1
V* R Oct Gaia DR3 4613972663311070208 Gaia DR2 4613972663311070208

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