The ASAS-SN catalogue of variable stars VI: an all-sky sample of delta Scuti stars

Kód výsledku v IS VaVaI

RIV/00216208:11320/20:10421814 - isvavai.cz

Výsledek na webu

https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=1sgKMCCyV-

DOI - Digital Object Identifier

10.1093/mnras/staa499

Jazyk výsledku

angličtina

Název v původním jazyce

The ASAS-SN catalogue of variable stars VI: an all-sky sample of delta Scuti stars

Popis výsledku v původním jazyce

We characterize an all-sky catalogue of similar to 8400 delta Scuti variables in ASAS-SN, which includes similar to 3300 new discoveries. Using distances from Gaia DR2, we derive period-luminosity relationships for both the fundamental mode and overtone pulsators in the W-JK, V, Gaia DR2 G, J, H, K-s, and W-1 bands. We find that the overtone pulsators have a dominant overtone mode, with many sources pulsating in the second overtone or higher order modes. The fundamental mode pulsators have metallicity-dependent periods, with log(10)(P) similar to -1.1 for [Fe/H] < -0.3 and log(10)(P) similar to -0.9 for [Fe/H] > 0, which leads to a period-dependent scale height. Stars with P > 0.100d are predominantly located close to the Galactic disc (vertical bar Z vertical bar < 0.5 kpc). The median period at a scale height of Z similar to 0 kpc also increases with the Galactocentric radius R, from log(10)(P) similar to -0.94 for sources with R > 9 kpc to log(10)(P) similar to -0.85 for sources with R < 7 kpc, which is indicative of a radial metallicity gradient. To illustrate potential applications of this all-sky catalogue, we obtained 30 min cadence, image subtraction TESS light curves for a sample of 10 fundamental mode and 10 overtone delta Scuti stars discovered by ASAS-SN. From this sample, we identified two new delta Scuti eclipsing binaries, ASASSN-V J071855.62-434247.3 and ASASSN-V J170344.20-615941.2 with short orbital periods of P-orb = 2.6096 and 2.5347 d, respectively.

Název v anglickém jazyce

The ASAS-SN catalogue of variable stars VI: an all-sky sample of delta Scuti stars

Popis výsledku anglicky

We characterize an all-sky catalogue of similar to 8400 delta Scuti variables in ASAS-SN, which includes similar to 3300 new discoveries. Using distances from Gaia DR2, we derive period-luminosity relationships for both the fundamental mode and overtone pulsators in the W-JK, V, Gaia DR2 G, J, H, K-s, and W-1 bands. We find that the overtone pulsators have a dominant overtone mode, with many sources pulsating in the second overtone or higher order modes. The fundamental mode pulsators have metallicity-dependent periods, with log(10)(P) similar to -1.1 for [Fe/H] < -0.3 and log(10)(P) similar to -0.9 for [Fe/H] > 0, which leads to a period-dependent scale height. Stars with P > 0.100d are predominantly located close to the Galactic disc (vertical bar Z vertical bar < 0.5 kpc). The median period at a scale height of Z similar to 0 kpc also increases with the Galactocentric radius R, from log(10)(P) similar to -0.94 for sources with R > 9 kpc to log(10)(P) similar to -0.85 for sources with R < 7 kpc, which is indicative of a radial metallicity gradient. To illustrate potential applications of this all-sky catalogue, we obtained 30 min cadence, image subtraction TESS light curves for a sample of 10 fundamental mode and 10 overtone delta Scuti stars discovered by ASAS-SN. From this sample, we identified two new delta Scuti eclipsing binaries, ASASSN-V J071855.62-434247.3 and ASASSN-V J170344.20-615941.2 with short orbital periods of P-orb = 2.6096 and 2.5347 d, respectively.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

LTAUSA18093: Časová proměnnost v astronomii: účast v projektu All-Sky Automated Survey for Supernovae

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2020

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Monthly Notices of the Royal Astronomical Society

ISSN

0035-8711

e-ISSN

—

Svazek periodika

493

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

23

Strana od-do

4186-4208

Kód UT WoS článku

000526035600081

EID výsledku v databázi Scopus

2-s2.0-85085386618