Last Updated: 2013jan23

Project Tanagra

Timing Analysis of Grating Data

hea-www.harvard.edu/tanagra/
| Introduction | Targets | Analysis | References |

Enter chorus, before King Harry

Introduction: A number of strong coronal sources have been observed with the Chandra gratings. In addition to high spectral resolution analysis, these sources can also be analyzed for their time variability.

We are carrying out a comprehensive program to analyze the temporal signatures of these sources. We plan to measure the magnitude and character of their variability, characterize their flare number distributions, and analyze the differences in behavior at different plasma temperatures, as detectable in specific spectral lines.


Homer, inspecting the Achaeans

Catalog of Cool Stars Observed with Chandra HETGS or LETGS
Name SpTyp Notes
     
24 UMa G4 III-IV ...
36 Oph K2 V + ... ...
44i Boo G1 V + G2 V ...
70 Oph K0 V + ... ...
AB Dor K1 IIIp+... ...
AD Leo M3.5 V 1 ACIS-S/HETG (45.9 ks), 2 HRC-S/LETG (58.5 ks)
Algol B8 V + K0 IV ...
alpha Cen G+ ...
Altair A7 V ...
AR Lac G2 IV + K0 IV ...
AU Mic M1 Ve 1 ACIS-S/HETG (58.8 ks), 1 HRC-S/LETG (49.6 ks)
AY Cet G5 IIIe + ... ...
beta Cet K0 III ...
Capella G5 IIIe+... ...
CC Eri M0 ...
CPD-66 3080B/V824 Ara M4.5 ...
DOAR 21 K0 ...
EK Dra G0 V ...
epsilon Eri K2 V ...
EQ Peg M3.5 ...
ER Vul G0 V + G5 V ...
EV Lac M3.5e ...
FK Com G5 II ...
GJ 338 M0.0 V ...
HD 111812/LS Com G0 IIIp ...
HD 199143 F7 V + ... 2 ACIS-S/HETG (130.1 ks)
HD 220657 F8 IV ...
HD 223460/OU And G1 IIIe ...
HD 32918/YY Men K1 IIIp ...
HD 37022/theta1 Ori E G ...
HD 45348/Canopus F0 II ...
HD 77137/TY Pyx G5 IV + G5 IV ...
HD 93497/mu Vel G5 IIIa ...
HDE 245059/lam Ori X-1 K1 ...
Hen 3-600 M3 ...
HIP 92680 K0 Vp ...
HR 1099 G5 IV + K1 IV ...
HR 5110 F0 ...
II Peg K2 V+... ...
IM Peg K1.5 II-IIIe ...
lambda And G8 III+... ...
pi1 UMa G1.5 Vb ...
pi3 Ori F6 V ...
Procyon F5 IV-V + ... 5 HRC-S/LETG (296.7 ks)
Prox Cen M5.5 Ve ...
sigma Gem K1 III 2 ACIS-S/HETG (120.8 ks)
Speedy Mic K0 V ...
SU Aur G2 IIIevar ...
theta1 Ori E G ...
TV Crt K5 Ve ...
TW Hya K8 Ve ...
TWA14 M0.5 ...
TZ CrB G0 V + G0 V ...
UV Cet M5.5 Ve ...
UX Ari G5 IV ...
V2129 Oph K5e ...
V4046 Sgr K5 ...
V471 Tau K0 ...
V824 Ara K1 Vp ...
V987 Tau G2 III ...
VW Cep K0 Vvar ...
xi Boo G8 V ...
xi UMa G0 V ...
YY Gem M0.5 V ...

 

List of Chandra Observations
Name ObsID Date Exposure
 

The finches, their beaks

Reprocessing

All data are reprocessed with CIAO 4.3 to obtain evt2 files and grating ARFs and RMFs. Transfer streak events are also extracted at the same time. The zeroth order events are extracted from evt1 files without excluding any grades.

Light curves

Light curves and flux curves are computed both as binned histograms as well as running averages.

Spectro-temporal Variability

Analyzing the variability in specific spectral lines such as O VIII 18.96 , Ne X 12.13 , etc.

 


References

References

Bibliography

Posson-Brown, J., Kashyap, V., Drake, J., Saar, S., & Scargle, J., 2012, Radio Stars & Their Lives in the Galaxy, MIT Haystack Observatory, Project Tanagra: A Spectro-Temporal Stellar Events Database
Poster [.pdf]
Kashyap, V., 2012, ICHASC Workshop, Imperial College, London, Aug 23, 2012, Simultaneous Weak Events
presentation [.pdf]
Posson-Brown, J., Kashyap, V., Saar, S., & Drake, J., 2011, AAS-HEAD, 10.05, Newport RI, Project Tanagra: Stellar Flares in Chandra High-Resolution Spectra
Abstract [@abstractonline]
Poster [.pdf]
Kashyap, V., Posson-Brown, J., Drake, J., Reeves, K., Saar, S., Wong, R., Lee, T., Connors, A., & Scargle, J., 2011, Digging Deeper: Algorithms for Computationally-Limited Searches in Astronomy Conference, Pasadena, CA, Dec 2011, Project Tanagra Timing Analysis of Grating Data
presentation [.pdf]
AR Lac spectro-temporal movie [.mpg]
Posson-Brown, J., Kashyap, V., & Grigis, P., 2011, Hinode 5, 96, Cambridge MA, Detecting Bright Points in Hinode XRT Lightcurves
Poster [.pdf]

Useful References

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Introduction
Targets
catalog
Chandra list
Analysis
References
| Introduction | Targets | Analysis | References |
This work is supported by CXC NASA Contract NAS8-39073 and Chandra grant AR0-11001X.