J/ApJ/902/114 Stellar X-ray activity. I. Chandra, Gaia & GALEX (Wang+, 2020)
Stellar X-ray activity across the Hertzsprung-Russell Diagram.
I. Catalogs.
Wang S., Bai Yu, He L., Liu J.
<Astrophys. J., 902, 114 (2020)>
=2020ApJ...902..114W 2020ApJ...902..114W
ADC_Keywords: X-ray sources; Stars, giant; Stars, dwarfs; YSOs; Ultraviolet;
Stars, distances; Optical
Keywords: Late-type stars ; Stellar activity ; X-ray stars ;
Young stellar objects ; Giant stars
Abstract:
Stellar magnetic activity provides substantial information on the
magnetic dynamo and the coronal heating process. We present a catalog
of X-ray activity for about 6000 stars, based on the Chandra and Gaia
DR2 data. We also classified more than 3000 stars as young stellar
objects, dwarf stars, or giant stars. By using the stars with valid
stellar parameters and classifications, we studied the distribution of
X-ray luminosity (LX) and the ratio of X-ray-to-bolometric
luminosities (RX), the positive relation between LX, RX, and
hardness ratio, and the long-term X-ray variation. This catalog can be
used to investigate some important scientific topics, including the
activity-rotation relation, the comparison between different activity
indicators, and the activities of interesting objects (e.g., A-type
stars and giants). As an example, we use the catalog to study the
activity-rotation relation, and find that the young stellar objects,
dwarfs, and giants fall on a single sequence in the relation RX
versus Rossby number, while the giants do not follow the relation RX
versus Prot-2R-4 valid for dwarfs.
Description:
We cross-matched the Chandra point-source catalog
(Wang+, 2016, J/ApJS/224/40) and the Gaia DR2 (Bailer-Jones+ 2018, I/347)
catalog (see Section 2.1).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 66 10063 Individual Chandra observation for stars
in our sample
table2.dat 124 5906 Main properties for the stars in our sample
table4.dat 65 604 Stars with UV emission in our sample (Section 4.2)
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See also:
B/chandra : The Chandra Archive Log (CXC, 1999-2014)
II/311 : WISE All-Sky Data Release (Cutri+ 2012)
II/335 : Revised catalog of GALEX UV sources (GUVcat_AIS GR6+7) (Bianchi+ 2017)
I/347 : Distances to 1.33 billion stars in Gaia DR2 (Bailer-Jones+, 2018)
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
I/349 : StarHorse, Gaia DR2 photo-astrometric distances (Anders+, 2019)
II/360 : Gaia DR2 x AllWISE catalogue (Marton+, 2019)
J/ApJ/574/258 : X-ray-emitting young stars in Orion (Feigelson+, 2002)
J/A+A/397/147 : Activity-rotation relationship in stars (Pizzolato+ 2003)
J/A+A/455/903 : ACIS-I observations of NGC 2264 (Flaccomio+, 2006)
J/ApJ/687/1264 : Age estimation for solar-type dwarfs (Mamajek+, 2008)
J/MNRAS/407/465 : Fast-rotating M dwarfs in NGC2516 (Jackson+, 2010)
J/AJ/141/50 : White-light flares on Kepler cool stars (Walkowicz+, 2011)
J/ApJ/743/48 : Stars with rot. periods & X-ray luminosities (Wright+, 2011)
J/other/Nat/485.478 : Superflares on solar-type stars (Maehara+, 2012)
J/A+A/551/L8 : Chromospheric activity of field stars (Pace, 2013)
J/ApJS/209/5 : Superflares of Kepler stars. I. (Shibayama+, 2013)
J/MNRAS/431/2063 : UV/X-ray activity of M dwarfs within 10pc (Stelzer+, 2013)
J/ApJ/776/67 : Rotational tracks (van Saders+, 2013)
J/ApJS/211/24 : Rotation periods of Kepler MS stars (McQuillan+, 2014)
J/MNRAS/447/2714 : Flare stars across the H-R diagram (Balona+, 2015)
J/MNRAS/454/1525 : XMM-Newton and Chandra monitoring of Sgr A* (Ponti+, 2015)
J/A+A/583/A65 : Active Kepler stars differential rotation (Reinhold+, 2015)
J/A+A/589/A113 : PMS stars in h Per (Argiroffi+, 2016)
J/ApJS/224/37 : White-light flares on Kepler close binaries (Gao+, 2016)
J/MNRAS/458/3479 : SVM selection of WISE YSO Candidates (Marton+, 2016)
J/ApJS/224/40 : Catalog of Chandra ACIS point like sources (Wang+, 2016)
J/MNRAS/467/1830 : Starspots on A stars (Balona, 2017)
J/ApJ/851/91 : Stat. studies of solar white-light flares (Namekata+, 2017)
J/ApJS/235/16 : UV emission of stars in LAMOST. I. Catalogs (Bai+, 2018)
J/A+A/616/A10 : 46 open clusters GaiaDR2 HR diag. (Gaia Collaboration, 2018)
J/ApJ/871/193 : Chandra & LAMOST study of stellar activity (He+, 2019)
J/ApJ/872/17 : HAZMAT V. UV & X evolution of K stars (Richey-Yowell+, 2019)
J/ApJS/241/29 : Flare catalog through LC data of Kepler DR25 (Yang+, 2019)
J/other/NatAs/4.03 : Rotation and activity across HR diagram (Lehtinen+, 2020)
J/other/NatAs/4.658 : Rotation and activity across HR diagram (Lehtinen+, 2020)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 16 A16 --- CXOGSG Object identifier
18- 21 A4 --- --- [acis]
22- 26 I5 --- ObsID Chandra/ACIS observation identifier
28- 36 F9.3 d MJD [51405.47/56987.76] Modified Julian Date
38- 43 F6.2 ct/ks CR [0.03/571] Count rate
45- 49 F5.2 ct/ks e_CR [0.03/22] Uncertainty in CR
51- 58 F8.1 10-15mW/m2 Flux [0.2/216000] Flux; 1e-15 erg/s/cm2
60- 66 F7.1 10-15mW/m2 e_Flux [0.1/34680] Uncertainty in Flux
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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- 16 A16 --- CXOGSG Object identifier (JHHMMSS.s+DDMMSS)
18- 26 F9.5 deg RAdeg Right Ascension (J2000)
28- 36 F9.5 deg DEdeg [-31.6/82.5] Declination (J2000)
38- 39 A2 --- Class Stellar classification ("g"= giant,
697 occurrences; d=dwarf; y=YSO;
See Section 2.3)
41- 45 I5 pc Dist [19/10520] Gaia DR2 distance
47- 50 I4 pc E_Dist [0/4337] Upper uncertainty in Dist
52- 55 I4 pc e_Dist [0/2644] Lower uncertainty in Dist
57- 60 F4.2 mag E(B-V) [0/3.6] The (B-V) color excess
from PS1 3D map
62- 68 F7.1 10-15mW/m2 Fx [0.2/14360] Average unabsorbed 0.3-8keV
flux (in units of 10-15erg/s/cm2)
70- 75 F6.1 10-15mW/m2 e_Fx [0.1/1266] Uncertainty in Fx
77- 83 E7.1 10-7W Lx [3.8e+26/3.8e+33] The 0.3-8keV luminosity;
erg/s
85- 91 E7.1 10-7W e_Lx [1e+26/1e+33] Uncertainty in Lx
93- 97 F5.2 [-] logRx [-8.1/-0.9] log X-ray to bolometric
luminosity ratio
99-102 F4.2 [-] e_logRx [0/0.6] Uncertainty in logRx
104-108 F5.2 --- HR1 [-0.99/1]? Hardness ratio,
HR1=(M-S)/(M+S) (1)
110-113 F4.2 --- e_HR1 [0/3.1]? Uncertainty in HR1
115-119 F5.2 --- HR2 [-1/0.99]? Hardness ratio,
HR2=(H-M)/(H+M) (2)
121-124 F4.2 --- e_HR2 [0/5.2]? Uncertainty in HR2
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Note (1): With S and M background-subtracted counts in soft (0.3-1keV) and
medium (1-2keV) bands, respectively.
Note (2): With M and H background-subtracted counts in medium (1-2keV) and
hard (2-8keV) bands, respectively.
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 16 A16 --- CXOGSG Object identifier
18- 21 F4.2 [mW/m2] logFUV [4.88/9.5]? log GALEX FUV excess flux
from activity
23- 26 F4.2 [mW/m2] e_logFUV [0.01/7.3]? Uncertainty in logFUV
28- 32 F5.2 [mW/m2] logNUV [4/16.3]? log GALEX NUV excess flux
from activity
34- 40 F7.2 [mW/m2] e_logNUV [0.01/2037]? Uncertainty in logNUV
42- 46 F5.2 [-] logR'FUV [-5.7/-0.8]? log GALEX FUV activity index
48- 51 F4.2 [-] e_logR'FUV [0.01/7.3]? Uncertainty in logR'FUV
53- 57 F5.2 [-] logR'NUV [-6.8/4.8]? log GALEX NUV activity index
59- 65 F7.2 [-] e_logR'NUV [0.01/2037]? Uncertainty in logR'NUV
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 20-Apr-2022