J/AJ/144/135 Spitzer 24µm photometry of Hipparcos F stars (Mizusawa+, 2012)
Exploring the effects of stellar rotation and wind clearing:
debris disks around F stars.
Mizusawa T.F., Rebull L.M., Stauffer J.R., Bryden G., Meyer M., Song I.
<Astron. J., 144, 135 (2012)>
=2012AJ....144..135M 2012AJ....144..135M
ADC_Keywords: Photometry, UBV ; Rotational velocities ; Photometry, infrared ;
Stars, F-type ; Stars, dwarfs
Keywords: circumstellar matter - infrared: stars
Abstract:
We have conducted a study of debris disks around F stars in order to
explore correlations between rotation, stellar winds, and
circumstellar disks. We obtained new 24µm photometry from the
Multiband Imaging Photometer for Spitzer (MIPS) camera for a sample of
188 relatively nearby F dwarfs with various rotation rates and optical
colors, and combined it with archival MIPS data for 66 more F stars,
as well as Wide-field Infrared Survey Explorer data for the entire
sample, plus 9 more F stars. Based on the objects' Ks-[24] and
[3.4]-[22] colors, we identify 22 stars in our sample as having 22
and/or 24µm excesses above our detection limit, 13 of which are new
discoveries. Our overall disk detection rate is 22/263, or 8%,
consistent with previous determinations of disk fractions in the solar
neighborhood. While fast-rotating stars are expected to have strong
winds capable of efficiently removing dust, we find no correlation
between rotational velocity and infrared excess. Similarly, we find no
significant difference in excess detection rate between late-type F
stars, which have convective surfaces, and early-type F stars, which
have fully radiative envelopes. However, the essentially unknown range
of ages in this sample may be washing out any effects relating
rotation, winds, and disks.
Description:
Each of the 188 relatively nearby F dwarfs observed as part of our
original Cycle-5 program 50449 (PI: L. Rebull) was observed using a
Multiband Imaging Photometer for Spitzer (MIPS) photometry AOR
(Astronomical Observation Request) at 24µm. We combined these
observations with archival MIPS data for 66 more F stars as well as
Wide-field Infrared Survey Explorer (WISE, Cat. II/311) data for the
entire sample, plus 9 more F stars. There are 265 stars in Table 1,
but only 263 stars in the final sample, having dropped 2, 1 with MIPS
data and 1 WISE-only object.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 150 265 Photometry and ancillary data of Hipparcos F stars
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See also:
II/311 : WISE All-Sky Data Release (Cutri+ 2012)
V/130 : Geneva-Copenhagen Survey of Solar neighbourhood III (Holmberg+, 2009)
VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)
I/259 : The Tycho-2 Catalogue (Hog+ 2000)
I/239 : The Hipparcos and Tycho Catalogues (ESA 1997)
J/ApJ/738/122 : ScoCen debris disks Around F- and G-type stars (Chen+, 2011)
J/ApJS/186/259 : Taurus Spitzer survey: new candidate members (Rebull+, 2010)
J/A+A/493/1099 : CaII HK emission in rapidly rotating stars (Schroeder+, 2009)
J/A+A/498/949 : Velocities of 1253 F-K dwarfs in open clusters
(Mermilliod+, 2009)
J/ApJ/698/1 : Spitzer observations of NGC 2362 (Currie+, 2009)
J/ApJ/679/720 : Spitzer observations of the Hyades (Cieza+, 2008)
J/ApJ/660/1556 : Characterization of dusty debris disks (Rhee+, 2007)
J/ApJ/653/675 : Spitzer 24µm photometry of A dwarfs (Su+, 2006)
J/ApJ/646/297 : Spitzer observations of pre-main-sequence stars
(Rebull+, 2006)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- --- [HIP]
4- 9 I6 --- HIP HIP number of the source
11- 12 I2 pc d Distance
14- 17 F4.2 mag Vmag The V band magnitude (1)
19- 22 F4.2 mag B-V The (B-V) color index (1)
24- 25 I2 km/s vsini Projected rotational velocity (2)
27- 36 A10 --- Sample Sample name (Blue-Rapid, Blue-Slow, Red-Slow,
Red-Rapid or dropped) (5)
38- 41 F4.2 mag Kmag The 2MASS Ks band magnitude (for 18 stars,
we obtained more accurate Ks estimates.
See Section 2.4.2 for more details)
43- 46 F4.2 mag e_Kmag Uncertainty in Kmag
48- 55 I8 -- AOR1 ? Spitzer Astronomical Observing Request
57- 64 I8 -- AOR2 ? Spitzer Astronomical Observing Request (3)
66- 73 I8 -- AOR3 ? Spitzer Astronomical Observing Request (3)
75- 79 F5.3 mag [24] ? Spitzer/MIPS 24µm band magnitude
81- 85 F5.3 mag e_[24] ? Uncertainty in [24]
87- 92 F6.3 mag K-24 ? The (Ks-24µm) color index (used as one
indicator of IR excess)
94- 98 F5.3 mag e_K-24 ? Uncertainty in K-24
100-105 F6.2 --- chi24 ? Calculated excess significance χ for 24µm
107-110 F4.2 mag [3.4] WISE 3.4µm band magnitude (W1, see II/311) (4)
112-115 F4.2 mag e_[3.4] Uncertainty in [3.4]
117-120 F4.2 mag [22] WISE 22µm band magnitude (W4, see II/311)
122-125 F4.2 mag e_[22] Uncertainty in [22]
127-132 F6.3 mag 3.4-22 The (3.4µm-22µm) color index
134-138 F5.3 mag e_3.4-22 Uncertainty in 3.4-22
140-144 F5.2 --- chi22 Calculated excess significance χ for 22µm
146-150 F5.2 --- chi Best excess significance χ used here
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Note (1): The B and V photometry comes from Tycho-2 (Cat. I/259). The
Bessel (2000PASP..112..961B 2000PASP..112..961B) formula was used to convert BT-VT to
(B-V) on the Johnson system.
Note (2): Mostly comes from Nordstrom et al. (2007, Cat. V/117, superseded
by Cat. V/130), though some come from Holmberg et al. (2007, Cat.
V/117, superseded by Cat. V/130) or Schroder et al. (2009, Cat.
J/A+A/493/1099).
Note (3): There are 69 objects for which MIPS-24 observations were obtained
external to program 50449. While most of these were MIPS photometry
AORs targeting our object of interest, many were not, and our object
of interest was caught serendipitously in a MIPS scan observation, or
a MIPS photometry observation of another target. Some were observed
in more than one AOR.
Note (4): The 3.4µm detections for the entire sample are saturated in
the original data, and the values used here are obtained via PSF
fitting to the wings of the detection.
Note (5): location in the Mv/B-V color-magnitude diagram: "blue" and
"red" are separated by the F5 division between radiative and
convective envelopes; these populations include "rapid" and "slow"
rotators. "Dropped" objects were not in the Spitzer target selection
because these were thought to be in the Spitzer Archive, but these
objects were just off the edge of the observations.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Sylvain Guehenneux [CDS] 21-Nov-2013