J/MNRAS/487/2937 Evidence for disc regulation in NGC 2264 (Orcajo+, 2019)
Evidence for disc regulation in the lowest mass stars of the young stellar
cluster NGC 2264.
Orcajo S., Cieza L.A., Gamen R., Peterson D.
<Mon. Not. R. Astron. Soc., 487, 2937-2946 (2019)>
=2019MNRAS.487.2937O 2019MNRAS.487.2937O (SIMBAD/NED BibCode)
ADC_Keywords: Stars, late-type ; Stars, variable ; Spectral types ;
Photometry, millimetric/submm
Keywords: stars: fundamental parameters - stars: low-mass - stars: rotation -
open clusters and associations: individual: NGC 2264
Abstract:
In the pre-main-sequence stage, star-disc interactions have been shown
to remove stellar angular momentum and regulate the rotation periods
of stars with M2 and earlier spectral types. Whether disc regulation
also extends to stars with later spectral types still remains a matter
of debate. Here, we present a star-disc interaction study in a sample
of over 180 stars with spectral types M3 and later (corresponding to
stellar masses ≤0.3M☉) in young stellar cluster NGC 2264.
Combining rotation periods from the literature, new and literature
spectral types, and newly presented deep Spitzer observations, we show
that stars with masses below 0.3M☉ with discs also rotate slower
than stars without a disc in the same mass regime. Our results
demonstrate that disc regulation still operates in these low-mass
stars, although the efficiency of this process might be lower than in
higher mass objects. We confirm that stars with spectral types earlier
and later than M2 have distinct period distributions and that stars
with spectral types M5 and later rotate even faster M3 and M4-type
stars.
Description:
Investigating the effect protoplanetary discs have on the rotation
periods of low-mass stars requires the combination of three sets of
data: rotation periods, a powerful disc indicator, and accurate
spectral types. Therefore, our analysis is restricted to stars with
known rotations periods from Cieza & Baliber (2007ApJ...671..605C 2007ApJ...671..605C,
Cat. J/ApJ/671/605), for which we have obtained deep Spitzer data for
disc identification and optical spectra for spectral typing.
Following Cieza & Baliber (2007ApJ...671..605C 2007ApJ...671..605C, Cat. J/ApJ/671/605),
we combined the 114 quality-1 rotation periods from Makidon et al.
(2004AJ....127.2228M 2004AJ....127.2228M, Cat. J/AJ/127/2228) and the 405 rotation periods
from Lamm et al. (2005A&A...430.1005L 2005A&A...430.1005L, Cat. J/A+A/430/1005). For the
74 stars in common, we adopted the rotation periods from Lamm et al.
(2005A&A...430.1005L 2005A&A...430.1005L, Cat. J/A+A/430/1005), resulting in a total of
445 periodic stars. Of these 445 stars, 163 have newer CoRoT rotation
periods from Venuti et al. (2017A&A...599A..23V 2017A&A...599A..23V, Cat. J/A+A/599/A23)
and 19 from Affer et al. (2013MNRAS.430.1433A 2013MNRAS.430.1433A, Cat. J/MNRAS/430/1433),
which we consider more reliable and adopt over those of Makidon et al.
(2004AJ....127.2228M 2004AJ....127.2228M, Cat. J/AJ/127/2228) and Lamm et al.
(2005A&A...430.1005L 2005A&A...430.1005L, Cat. J/A+A/430/1005). However, we note that a
large fraction (>50 per cent) of the periodic stars identified by
ground-based observations are fainter than R∼17mag and were not
monitored by CoRoT. The rotation periods of the entire sample are
listed in Table 1
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 136 445 Periods, photometry and spectral types for
NGC 2264 members
tablea1.dat 38 84 Spectral types, Hα and CaII presences
in field stars
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See also:
J/AJ/114/2644 : UBVRIHa photometry of NGC2264 (Sung+, 1997)
J/AJ/127/1117 : Halpha emission-line stars in NGC2264 (Reipurth+, 2004)
J/A+A/590/A78 : NGC2264 weak-line T Tauri lithium abundances (Bouvier+, 2016)
J/A+A/609/A10 : NGC2264 structure and star formation history (Venuti+, 2018)
J/ApJ/821/8 : Spectroscopic binary population of ONC and NGC2264
(Kounkel+, 2020)
J/A+A/670/A37 : Spatial and dynamical structure of NGC2264 (Flaccomio+, 2023)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 F9.5 deg RAdeg Right ascension (J2000)
11- 17 F7.5 deg DEdeg Declination (J2000)
19- 23 F5.2 mag Rcmag Photometry in Rc-band
25- 29 F5.2 mag Icmag Photometry in Ic-band
31- 40 E10.4 mJy F3.6 Spitzer flux [3.6]-band
42- 51 E10.4 mJy e_F3.6 Error in flux [3.6]-band
53- 62 E10.4 mJy F4.5 Spitzer flux [4.5]-band
64- 73 E10.4 mJy e_F4.5 Error in flux [4.5]-band
75- 84 E10.4 mJy F5.8 Spitzer flux [5.8]-band
86- 95 E10.4 mJy e_F5.8 Error in flux [5.8]-band
97-106 E10.4 mJy F8.0 Spitzer flux [8.0]-band
108-117 E10.4 mJy e_F8.0 Error in flux [8.0]-band
119-124 F6.3 d Per Period
126-128 A3 --- Ref1 Period reference (1)
130-134 A5 --- SpType Spectral type
136 A1 --- Ref2 [123-] Spectral references (2)
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Note (1): Period references as follows:
Ven = Venuti et al. (2017A&A...599A..23V 2017A&A...599A..23V, Cat. J/A+A/599/A23)
Aff = Affer et al. (2013MNRAS.430.1433A 2013MNRAS.430.1433A, Cat. J/MNRAS/430/1433)
Lam = Lamm et al. (2005A&A...430.1005L 2005A&A...430.1005L, Cat. J/A+A/430/1005)
Mak = Makidon et al. (2004AJ....127.2228M 2004AJ....127.2228M, Cat. J/AJ/127/2228)
Note (2): Spectral references as follows:
1 = our spectral types
2 = Rebull et al. (2002AJ....123.1528R 2002AJ....123.1528R, Cat. J/AJ/123/1528)
3 = Skiff (2009-2016, Cat. B/mk)
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Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 9 F9.5 deg RAdeg Right ascension (J2000)
11- 17 F7.5 deg DEdeg Declination (J2000)
19- 20 A2 --- SpType Spectral type
22 I1 --- Halpha [0/1] Hα spectral line
(1 = emission, 0 = absorption)
24- 30 F7.2 0.1nm EW Equivalent width
32- 36 F5.2 0.1nm e_EW Error in EW
38 I1 --- CaII [0/1] CaII spectral line
(1 = emission, 0 = absorption)
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Acknowledgements:
Santiago Orcajo, santi(at)fcaglp.unlp.edu.ar
(End) Patricia Vannier [CDS] 30-Jul-2023