TY - JOUR
T1 - North-PHASE
T2 - Studying periodicity, hot spots, accretion stability and early evolution in young stars in the northern hemisphere
AU - Sicilia-Aguilar, A
AU - Kahar, R S
AU - Pelayo-Baldárrago, M E
AU - Roccatagliata, V
AU - Froebrich, D
AU - Galindo-Guil, F J
AU - Campbell-White, J
AU - Kim, J S
AU - Mendigutía, I
AU - Schlueter, L
AU - Teixeira, P S
AU - Matsumura, S
AU - Fang, M
AU - Scholz, A
AU - Ábrahám, P
AU - Frasca, A
AU - Garufi, A
AU - Herbert, C
AU - Kóspál, Á
AU - Manara, C F
N1 - Funding: RK is funded by the STFC under grant number ST/W507404/1. LS was funded by the RAS Undergraduate Summer Bursary. VR acknowledges the support of the Italian National Institute of Astrophysics (INAF) through the INAF GTO Grant ‘ERIS & SHARK GTO data exploitation’ and the European Union’s Horizon 2020 research and innovation program and the European Research Council via the
ERC Synergy Grant ‘ECOGAL’ (project ID 855130). JCW and CM are Funded by the European Union (ERC, WANDA, 101039452).
PY - 2024/8
Y1 - 2024/8
N2 - We present the overview and first results from the North-PHASE Legacy Survey, which follows six young clusters for five years, using the 2 deg2 FoV of the JAST80 telescope from the Javalambre Observatory (Spain). North-PHASE investigates stellar variability on timescales from days to years for thousands of young stars distributed over entire clusters. This allows us to find new YSO, characterise accretion and study inner disk evolution within the cluster context. Each region (Tr 37, Cep OB3, IC 5070, IC 348, NGC 2264, and NGC 1333) is observed in six filters (SDSS griz, u band, and J0660, which covers Hα), detecting cluster members as well as field variable stars. Tr 37 is used to prove feasibility and optimise the variability analysis techniques. In Tr 37, variability reveals 50 new YSO, most of them proper motion outliers. North-PHASE independently confirms the youth of astrometric members, efficiently distinguishes accreting and non-accreting stars, reveals the extent of the cluster populations along Tr37/IC 1396 bright rims, and detects variability resulting from rotation, dips, and irregular bursts. The proper motion outliers unveil a more complex star formation history than inferred from Gaia alone, and variability highlights previously hidden proper motion deviations in the surrounding clouds. We also find that non-YSO variables identified by North-PHASE cover a different variability parameter space and include long-period variables, eclipsing binaries, RR Lyr, and δ Scuti stars. These early results also emphasize the power of variability to complete the picture of star formation where it is missed by astrometry.
AB - We present the overview and first results from the North-PHASE Legacy Survey, which follows six young clusters for five years, using the 2 deg2 FoV of the JAST80 telescope from the Javalambre Observatory (Spain). North-PHASE investigates stellar variability on timescales from days to years for thousands of young stars distributed over entire clusters. This allows us to find new YSO, characterise accretion and study inner disk evolution within the cluster context. Each region (Tr 37, Cep OB3, IC 5070, IC 348, NGC 2264, and NGC 1333) is observed in six filters (SDSS griz, u band, and J0660, which covers Hα), detecting cluster members as well as field variable stars. Tr 37 is used to prove feasibility and optimise the variability analysis techniques. In Tr 37, variability reveals 50 new YSO, most of them proper motion outliers. North-PHASE independently confirms the youth of astrometric members, efficiently distinguishes accreting and non-accreting stars, reveals the extent of the cluster populations along Tr37/IC 1396 bright rims, and detects variability resulting from rotation, dips, and irregular bursts. The proper motion outliers unveil a more complex star formation history than inferred from Gaia alone, and variability highlights previously hidden proper motion deviations in the surrounding clouds. We also find that non-YSO variables identified by North-PHASE cover a different variability parameter space and include long-period variables, eclipsing binaries, RR Lyr, and δ Scuti stars. These early results also emphasize the power of variability to complete the picture of star formation where it is missed by astrometry.
KW - Techniques: photometric
KW - Surveys
KW - Stars:formation
KW - Stars: variables: general
KW - Stars: variables: T Tauri, Herbig Ae/Be
KW - Open clusters and associations: individual: Tr 37, NGC 2264, NGC 1333, Cep Ob3, IC 5070, IC 348
U2 - 10.1093/mnras/stae1588
DO - 10.1093/mnras/stae1588
M3 - Article
SN - 0035-8711
VL - 532
SP - 2108
EP - 2132
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 2
ER -