J/MNRAS/519/3958 Young intermediate-mass stars stellar param. (Iglesias+, 2023)
X-shooter survey of young intermediate-mass stars.
I. Stellar characterization and disc evolution.
Iglesias D.P., Panic O., van den Ancker M., Petr-Gotzens M.G., Siess L.,
Vioque M., Pascucci I., Oudmaijer R., Miley J.
<Mon. Not. R. Astron. Soc. 519, 3958 (2023)>
=2023MNRAS.519.3958I 2023MNRAS.519.3958I (SIMBAD/NED BibCode)
ADC_Keywords: Stars, pre-main sequence ; Stars, early-type ; Photometry ;
Optical ; Photometry, infrared ; Stars, distances ;
Radial velocities
Keywords: stars: circumstellar matter - stars: early-type - stars: evolution -
stars: fundamental parameters - stars: pre-main-sequence
Abstract:
Intermediate-mass stars (IMSs) represent the link between low-mass and
high-mass stars, and cover a key mass range for giant planet
formation. In this paper, we present a spectroscopic survey of 241
young IMS candidates with IR-excess, the most complete unbiased sample
to date within 300 pc. We combined VLT/X-Shooter spectra with BVR
photometric observations and Gaia DR3 distances to estimate
fundamental stellar parameters such as Teff, mass, radius, age, and
luminosity. We further selected those stars within the
intermediate-mass range 1.5-3.5 solar masses, and discarded old
contaminants. We used 2MASS and WISE photometry to study the
IR-excesses of the sample, finding 92 previously unidentified stars
with IR-excess. We classified this sample into "protoplanetary",
"hybrid candidates", and "debris" discs based on their observed
fractional excess at 12 microns, finding a new population of 17 hybrid
disc candidates. We studied inner disc dispersal time-scales for
wavelengths under 10 microns and found very different trends for IMSs
and low-mass stars (LMSs). IMSs show excesses dropping fast during the
first 6Myr independently of the wavelength, while LMSs show
consistently lower fractions of excess at the shortest wavelengths,
and increasingly higher fractions for longer wavelengths with slower
dispersal rates. In conclusion, this study demonstrates empirically
that IMSs dissipate their inner discs very differently than LMSs,
providing a possible explanation for the lack of short period planets
around IMSs.
Description:
This catalogue contains a description of the observations and
literature data used for this survey and the stellar parameters
obtained for a sample of 241 intermediate mass candidates.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 96 241 Objects, coordinates and description of the
X-Shooter observations
table2.dat 125 241 Objects, spectral types, magnitudes and
distances from the literature
table3.dat 191 241 Stellar parameters obtained for the whole sample
table6a.dat 120 135 Fractional excesses and disc classification
based on f12um for the refined selection of
young IMS
table6b.dat 120 106 Fractional excesses and disc classification
based on f12um for the rest of the sample
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- Name Identifier used across this work
17- 29 A13 --- SimbadID Identifier used in Simbad
31- 32 I2 h RAh Right Ascension (J2000)
34- 35 I2 min RAm Right Ascension (J2000)
37- 41 F5.2 s RAs Right Ascension (J2000)
43 A1 --- DE- Declination sign (J2000)
44- 45 I2 deg DEd Declination (J2000)
47- 48 I2 arcmin DEm Declination (J2000)
50- 53 F4.1 arcsec DEs Declination (J2000)
55- 57 I3 --- Nobs Number of observations
59- 82 A24 --- Obs.date Observation date (first and last for the
case of multiple observations)
84- 87 I4 --- SNR-UVB Signal to noise ratio in the UVB
89- 91 I3 --- SNR-VIS Signal to noise ratio in the VIS
93- 96 I4 --- SNR-NIR Signal to noise ratio in the NIR
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- Name Identifier used across this work
17 A1 --- Flag [*] * if it has been previously studied
in the literature
19- 31 A13 --- SpType Spectral type from Tycho-2 catalogue
33- 37 F5.2 mag BTmag B magnitude from Tycho-2 catalogue
39- 43 F5.2 mag VTmag V magnitude from Tycho-2 catalogue
45- 49 F5.2 mag Rmag ? R magnitude from USNO-B catalogue
51- 55 F5.2 mag Ksmag Ks magnitude from 2MASS catalogue
57- 60 F4.2 mag e_Ksmag Error in Ksmag
62- 66 F5.2 mag W1mag W1 magnitude from allWISE catalogue
68- 71 F4.2 mag e_W1mag Error in W1mag
72 A1 --- l_W2mag Upper limit flag on W2mag
73- 77 F5.2 mag W2mag W2 magnitude from allWISE catalogue
81- 84 F4.2 mag e_W2mag ? Error in W2mag
86- 90 F5.2 mag W3mag W3 magnitude from allWISE catalogue
92- 95 F4.2 mag e_W3mag Error in W3mag
97-101 F5.2 mag W4mag W4 magnitude from allWISE catalogue
103-106 F4.2 mag e_W4mag Error in W4mag
108-113 F6.2 pc Dist Photogeometric distance from Gaia DR3 (rpgeo)
115-119 F5.2 pc E_Dist Upper uncertainty for Distance
121-125 F5.2 pc e_Dist Lower uncertainty for Distance
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- Name Identifier used across this work
17- 19 I3 km/s RV Mean radial velocity
21- 22 I2 km/s e_RV Mean error in radial velocity
24- 26 I3 km/s vsini Projected rotational velocity
28- 32 I5 K Teff Effective Temperature
34- 37 I4 K e_Teff Uncertainty in effective Temperature
39- 41 F3.1 [cm/s2] logg Logarithm of surface gravity
43- 45 F3.1 [cm/s2] e_logg Uncertainty in logg
47- 50 F4.2 mag Av Visual extinction
52- 55 F4.2 mag E_Av Upper uncertainty in Av
57- 60 F4.2 mag e_Av Lower uncertainty in Av
62- 67 F6.2 pc/Rsun DR Distance over radius ratio
69- 73 F5.2 pc/Rsun E_DR Upper uncertainty in DR
75- 79 F5.2 pc/Rsun e_DR Lower uncertainty in DR
81- 85 F5.2 Rsun R Stellar radius in solar radii
87- 90 F4.2 Rsun E_R Upper uncertainty in R
92- 95 F4.2 Rsun e_R Lower uncertainty in R
97-102 F6.1 Lsun L Stellar Luminosity in solar luminosities
104-108 F5.1 Lsun E_L Upper uncertainty in L
110-114 F5.1 Lsun e_L Lower uncertainty in L
116-119 F4.2 Msun MpreMS Stellar mass estimated from
pre-main-sequence evolutionary tracks
(in solar masses)
121-124 F4.2 Msun E_MpreMS Upper uncertainty in M_preMS
126-129 F4.2 Msun e_MpreMS Lower uncertainty in M_preMS
131-135 F5.2 Myr AgepreMS Age estimated from pre-main-sequence
evolutionary tracks (in million years)
137-141 F5.2 Myr E_AgepreMS Upper uncertainty in Age_preMS
143-147 F5.2 Myr e_AgepreMS Lower uncertainty in Age_preMS
149-152 F4.2 Msun MpostMS Stellar mass estimated from
post-main-sequence evolutionary tracks
(in solar masses)
154-157 F4.2 Msun E_MpostMS Upper uncertainty in M_postMS
159-162 F4.2 Msun e_MpostMS Lower uncertainty in M_postMS
164-170 F7.2 Myr AgepostMS Age estimated from post-main-sequence
evolutionary tracks (in million years)
172-178 F7.2 Myr E_AgepostMS Upper uncertainty in Age_postMS
180-186 F7.2 Myr e_AgepostMS Lower uncertainty in Age_postMS
188-191 A4 --- Flag [pre post] Most likely mass and age values
(pre or post main-sequence)
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Byte-by-byte Description of file: table6a.dat table6b.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- Name Identifier used across this work
17- 20 F4.2 --- f2.2um Fractional excess at 2.2 microns
22- 25 F4.2 --- E_f2.2um Upper uncertainty in f2.2um
27- 30 F4.2 --- e_f2.2um Lower uncertainty in f2.2um
32- 36 F5.2 --- f3.4um Fractional excess at 3.4 microns
38- 41 F4.2 --- E_f3.4um Upper uncertainty in f3.4um
43- 46 F4.2 --- e_f3.4um Lower uncertainty in f3.4um
48- 52 F5.2 --- f4.6um Fractional excess at 4.6 microns
54- 57 F4.2 --- E_f4.6um Upper uncertainty in f4.6um
59- 62 F4.2 --- e_f4.6um Lower uncertainty in f4.6um
64- 69 F6.2 --- f12um Fractional excess at 12 microns
71- 76 F6.2 --- E_f12um Upper uncertainty in f12um
78- 83 F6.2 --- e_f12um Lower uncertainty in f12um
85- 91 F7.2 --- f22um Fractional excess at 22 microns
93- 98 F6.2 --- E_f22um Upper uncertainty in f22um
100-105 F6.2 --- e_f22um Lower uncertainty in f22um
107-120 A14 --- DiscClass Disc classification based on f12um
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Acknowledgements:
Daniela Iglesias, D.P.Iglesias(at)leeds.ac.uk
(End) Patricia Vannier [CDS] 26-Apr-2023