2023RNAAS...7..244B

Query : 2023RNAAS...7..244B

2023RNAAS...7..244B - Research Notes of the AAS, 7, 244 (2023/November-0)

Late Type Stars in the Michigan Spectral Catalogue: Conflation of Luminosity Classes IV and V.

BORD D.J. and SOWELL J.R.

Abstract (from CDS):

While computing a comprehensive set of mean values and uncertainties for key stellar parameters, particularly absolute V magnitudes and (B - V)₀ colors, for main sequence stars drawn from the Michigan Spectral Catalogue (MSC), we discovered a significant co-mingling between luminosity classes IV and V in spectral types G8 and later. Indeed, among the ∼200 nearby K0 dwarfs examined, as many 20% may be misclassified subgiants. We present data to substantiate this view and offer some commentary on the observed conflation of these two luminosity classes. We conclude that while the MSC is a unique and largely reliable database for spectral classifications of predominantly southern hemisphere HD stars across the H-R diagram, it does contain some ambiguities in the assignment of luminosity classes IV and V among the late G and early K stars of which users should be aware.

Journal keyword(s): Hertzsprung Russell diagram - K dwarf stars - K subgiant stars

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	HD 140687	PM*	15 45 49.8288407832	-24 43 00.529974048		8.47	7.51			K0V	12	0

Query : 2023RNAAS...7..244B

Basic data :

HD 140687 -- High Proper Motion Star

* (HD,CD,...), PM* (2016A&A), NIR (2MASS)

15 45 49.8288407832 -24 43 00.529974048 (Optical) [ 0.0205 0.0153 90 ] A 2020yCat.1350....0G

15 42 50.9264141415 -24 33 38.318882131 [ 0.0205 0.0153 90 ]

345.9170569913567 +23.2543914874093 [ 0.0205 0.0153 90 ]

-83.255 -58.170 [0.030 0.020 90] A 2020yCat.1350....0G

V(km/s) 1.7 [2] / z(~) 0.000006 [0.000007] / cz 1.70 [2.00] E 1953GCRV..C......0W

13.065 [0.0232] A 2020yCat.1350....0G

K0V C 1988MSS...C04....0H

B 8.47 [0.02] D 2000A&A...355L..27H

V 7.51 [0.01] D 2000A&A...355L..27H

G 7.258433 [0.002760] C 2020yCat.1350....0G

J 5.865 [0.018] C 2003yCat.2246....0C

H 5.369 [0.023] C 2003yCat.2246....0C

K 5.278 [0.023] C 2003yCat.2246....0C

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`HD 140687`	`GSC 06781-00720`	`TIC 23376565`	`Gaia DR3 6236729848841353472`
`CD-24 12275`	`2MASS J15454983-2443004`	`TYC 6781-720-1`	`Gaia DR1 6236729844541948800`
`CPD-24 5555`	`PPM 264657`	`WEB 13083`
`GC 21176`	`SAO 183767`	`YZ 114 11121`
`GCRV 9087`	`SKY# 28505`	`Gaia DR2 6236729848841353472`

References (12 between 1850 and 2026) (Total 12)
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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`HD 140687`	`CD-24 12275`	`CPD-24 5555`	`GSC 06781-00720`	`2MASS J15454983-2443004`
`PPM 264657`	`SAO 183767`	`TYC 6781-720-1`	`Gaia DR2 6236729848841353472`	`Gaia DR3 6236729848841353472`
`Gaia DR1 6236729844541948800`

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