J/A+A/675/A203 NGC 376 photometric catalogue (Tsilia+, 2023)
Photometric determination of the mass accretion rates of pre-main sequence
stars. VII. The low-density cluster NGC 376 in the Small Magellanic Cloud.
Tsilia S., De Marchi G., Panagia N.
<Astron. Astrophys. 675, A203 (2023)>
=2023A&A...675A.203T 2023A&A...675A.203T (SIMBAD/NED BibCode)
ADC_Keywords: Magellanic Clouds ; Clusters, open ; Stars, pre-main sequence ;
Photometry, HST ; Photometry, H-alpha
Keywords: stars: formation - stars: pre-main sequence - Magellanic Clouds -
galaxies: star clusters: individual: NGC 376 -
open clusters and associations: individual: NGC 376
Abstract:
We study the properties of low-mass stars recently formed in the field
of the NGC 376 cluster in the Small Magellanic Cloud (SMC).
Using photometric observations acquired with the Hubble Space
Telescope (HST) in the V, I, and H-alpha bands, we identify 244
candidate pre-main sequence (PMS) stars showing H-alpha excess
emission at the 5-sigma level and with H-alpha equivalent width of
20Å or more. We derive physical parameters for all PMS stars,
including masses, ages, and mass accretion rates. We compare the
effective mass accretion rate of stars in NGC 376 to that of objects
in the NGC 346 cluster, with NGC 346 featuring similar metallicity but
higher total mass and gas density.
We find a median age of 28Myr for this population (with 25th and 75th
percentiles at about 20 and 40Myr, respectively),
in excellent agreement with previous studies of massive stars in the
same field. The PMS stars are rather uniformly distributed across the
field, whereas massive stars are more clustered. The spatial
distribution of PMS objects is compatible with them having formed in
the centre of the cluster and then migrating outwards. We find that in
NGC 376 the mass accretion rate is systematically lower than in NGC
346 for stars of the same mass and age. This indicates that, in
addition to metallicity, there are other environmental factors
affecting the rate of mass accretion onto PMS stars. Our observations
suggest that the gas density in the star-forming region might play a
role.
Description:
Photometric catalogue of objects with uncertainty in H-alpha smaller
than 0.2mag. The columns give the object identification,
detector coordinates, magnitudes and corresponding uncertainties.
Objects:
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RA (2000) DE Designation(s)
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01 03 50.20 -72 49 33.4 NGC 376 = Cl Kron 49
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 67 6008 Photometric catalogue of objects with
uncertainty in Hα smaller than 0.2mag
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See also:
J/MNRAS/421/78 : LMC pre-main sequences stars mass accretion rates
(Spezzi+, 2012)
J/ApJ/875/51 : Mass accretion rates of PMS stars. VI. LH95 in LMC
(Biazzo+, 2019)
J/A+A/675/A204 : Properties of PMS stars in NGC 299 (Vlasblom+, 2023)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- ID Object identification
7- 13 F7.2 pix X X detector coordinate
16- 22 F7.2 pix Y Y detector coordinate
25- 30 F6.3 mag Vmag Magnitude in the V band
33- 37 F5.3 mag e_Vmag Photometric uncertainty in the V band
40- 45 F6.3 mag Imag Magnitude in the I band
48- 52 F5.3 mag e_Imag Photometric uncertainty in the I band
55- 60 F6.3 mag Hamag Magnitude in the H-alpha band
63- 67 F5.3 mag e_Hamag Photometric uncertainty in the H-alpha band
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Acknowledgements:
Styliani Tsilia, tsilia(at)strw.leidenuniv.nl
References:
De Marchi et al., Paper I 2010ApJ...715....1D 2010ApJ...715....1D
De Marchi et al., Paper II 2011ApJ...740...11D 2011ApJ...740...11D
Spezzi et al., Paper III 2012MNRAS.421...78S 2012MNRAS.421...78S, Cat. J/MNRAS/421/78
De Marchi et al., Paper IV 2013ApJ...775...68D 2013ApJ...775...68D
De Marchi et al., Paper V 2017ApJ...846..110D 2017ApJ...846..110D
Biazzo et al., Paper VI 2019ApJ...875...51B 2019ApJ...875...51B, Cat. J/ApJ/875/51
Vlasblom & De Marchi, Paper VIII 2023A&A...675A.204V 2023A&A...675A.204V, Cat. J/A+A/675/A204
(End) Patricia Vannier [CDS] 22-Jun-2023