Studying activity in Pre-CVs secondaries: The case of ... · A hibernating CV? Tiago Ribeiro,...

The case ofEC13471-

1258.

Tiago Ribeiro,Stella Kafka,RaymundoBaptista

Outline

Introduction

Observations

Analysis

Photometry

Spectroscopy

References

WILD STARS IN THE OLD WEST II

Studying activity in Pre-CVs secondaries: Thecase of EC13471-1258.

Tiago Ribeiro1 Stella Kafka2 Raymundo Baptista1

1- Universidade Federal de Santa Catarina, Brasil

2- Spitzer Science Center/Caltech, USA

March 17, 2009

Tiago Ribeiro, Stella Kafka, Raymundo Baptista The case of EC13471-1258.

The case ofEC13471-

1258.


Outline

Introduction

Observations

Analysis

Photometry

Spectroscopy

References

1 Introduction

2 Observations

3 AnalysisPhotometrySpectroscopy


The case ofEC13471-

1258.


Outline

Introduction

Observations

Analysis

Photometry

Spectroscopy

References

The hunt for active secondary stars on CVs

Dynamo properties

Differences above/belowthe period-gap

Impact to binary evolution

Impact on mass transferhistory(?!)


The case ofEC13471-

1258.


Outline

Introduction

Observations

Analysis

Photometry

Spectroscopy

References

Part 1: The tale of EC13471-1265 (QS Vir)

Basic properties (O’Donoghue et al., 2003):

DA(T1 = 14000K) +M3.5-4V (T2 = 3100K)

P= 3.62h - eclipsing(i = 75◦)

Low level acretion?

Active secondary?

A hibernating CV?


The case ofEC13471-

1258.


Outline

Introduction

Observations

Analysis

Photometry

Spectroscopy

References

Shooting the scene: Take 1.

”... in order to assist modelling of the binary, the VRI photometry are

listed in full in table 6.” (O’Donoghue et al., 2003)

0.5 1.0 1.5 2.0φ

0

5

10

15

20

25

30

35

40

Flux (

mJy

)

JD1

0.5 1.0 1.5 2.0φ

JD2

0.5 1.0 1.5 2.0φ

JD3

0.5 1.0 1.5 2.0φ

JD4

0.5 1.0 1.5 2.0φ

0

5

10

15

20

25

30

35

40

Flux (

mJy

)

JD1

0.5 1.0 1.5 2.0φ

JD2

0.5 1.0 1.5 2.0φ

JD3

0.5 1.0 1.5 2.0φ

JD4

Flux calibrated using Schaifers and Voigt (1982)

-0.5 0.0 0.5 1.0 1.5φ

0

10

20

30

40

50

60

70

80

90

flux (

mJy

) VRIJH

1.6m Perking & Elmer + CAMIV (1024×1024

HAWAII detector) @ OPD, MG - Brasil


The case ofEC13471-

1258.


Outline

Introduction

Observations

Analysis

Photometry

Spectroscopy

References

Shooting the scene: Take 2.

RC Spectrograph on the CTIO 4-m Blanco

0

2000

4000

6000

Phase=0.004

2000

4000

6000Phase=0.258

2000

4000

6000

8000Phase=0.510

4000 5000 6000 7000

2000

4000

6000

Phase=0.764


The case ofEC13471-

1258.


Outline

Introduction

Observations

Analysis

Photometry

Spectroscopy

References

Digging into the gold mine...

Par. V R I J HF2(mJy) 3.05± 0.02 7.66± 0.04 28.2± 0.1 68.3± 0.4 72.8± 0.4F1(mJy) 3.42± 0.02 2.60± 0.05 2.2± 0.2 0.9± 0.1 1.0± 0.2F2/FT 47% 74% 93% 99% 99%

Simultaneously fitted parameters:i = (74.9± 0.6)◦ q = (0.50± 0.05)

i = (75.5± 2.0)◦ and q = 0.55± 0.1 (O’Donoghue et al., 2003)

-0.5 0.0 0.5 1.0 1.5φ

0

10

20

30

40

50

60

70

80

90

flux (

mJy

) VRIJH

0

5

10

15

20

25

30

35

40

Flux (

mJy

)

VRI light curve of EC13471-1258.

VRI

0.0 0.5 1.0 1.5 2.0φ

-4

-2

0

2

4

% (

O-C

)/avg

+ JD3 flaring light curve...


The case ofEC13471-

1258.


Outline

Introduction

Observations

Analysis

Photometry

Spectroscopy

References

Digging into the gold mine...

Par. V R I J HF2(mJy) 3.05± 0.02 7.66± 0.04 28.2± 0.1 68.3± 0.4 72.8± 0.4F1(mJy) 3.42± 0.02 2.60± 0.05 2.2± 0.2 0.9± 0.1 1.0± 0.2F2/FT 47% 74% 93% 99% 99%

Simultaneously fitted parameters:i = (74.9± 0.6)◦ q = (0.50± 0.05)

i = (75.5± 2.0)◦ and q = 0.55± 0.1 (O’Donoghue et al., 2003)

-0.5 0.0 0.5 1.0 1.5φ

0

10

20

30

40

50

60

70

80

90

flux (

mJy

) VRIJH 0

5

10

15

20

25

30

35

40

Flux (

mJy

)

VRI light curve of EC13471-1258.

VRI

0.0 0.5 1.0 1.5 2.0φ

-4

-2

0

2

4

% (

O-C

)/avg

+ JD3 flaring light curve...


The case ofEC13471-

1258.


Outline

Introduction

Observations

Analysis

Photometry

Spectroscopy

References

Robbing the bankLight curve inversion (Lanza et al., 1998)

6.5

7.0

7.5

flux (

mJy

)

-500

50

Lati

dude

9.510.010.511.011.512.012.513.0

flux (

mJy

)

-500

50

Lati

dude

29303132333435363738

flux (

mJy

)

0.0 0.2 0.4 0.6 0.8 1.0φ

-500

50

Lati

dude

0.0 0.2 0.4 0.6 0.8 1.0φ


The case ofEC13471-

1258.


Outline

Introduction

Observations

Analysis

Photometry

Spectroscopy

References

The huntRVs and EWs

65

35

65

55

65

75

65

950.0

0.5

1.0

1.5

2.0Hα

48

36

48

52

48

68

48

84

Hβ

43

16

43

32

43

48

43

64

Hγ

40

76

40

92

41

08

41

24

Hδ

3920 3930 3940 3950 3960 3970 3980 39900.0

0.5

1.0

1.5

2.0

EW(Hα) ∼ -17A during flaring

events and ∼ -6A normal state

(Kawka et al., 2002)

0

-5

-10

-15

-20

-250.1 0.0

0.25

0.50

0.75

1.0

0.8 0.85 0.90

-5

-10

-15

-20

HJD-2454177

2.7 2.8 2.9 3

HJD-2454177


The case ofEC13471-

1258.


Outline

Introduction

Observations

Analysis

Photometry

Spectroscopy

References

The arrestmentDoppler Tomography: Spruit (1998) MEM code

-500

0

500

v (

km/s

)Hα Hβ

-500 0 500v (km/s)

-500

0

500

v (

km/s

)

Hγ

-500 0 500v (km/s)

Hδ

CaII H

-500 0 500v (km/s)

CaII K


The case ofEC13471-

1258.


Outline

Introduction

Observations

Analysis

Photometry

Spectroscopy

References

The judgmentRoche Tomography: Watson and Dhillon (2001)

φ = -0.25 φ = 0.25

North Pole

φ = 0.5 φ = 0.


The case ofEC13471-

1258.


Outline

Introduction

Observations

Analysis

Photometry

Spectroscopy

References

Hanging × EscapingRT × LC

Correlation between photospheric and chromospheric activity(Korhonen et al., 2007; Alekseev and Kozlova, 2003, 2002).


The case ofEC13471-

1258.


Outline

Introduction

Observations

Analysis

Photometry

Spectroscopy

References

Acknowledgments


The case ofEC13471-

1258.


Outline

Introduction

Observations

Analysis

Photometry

Spectroscopy

References

References I

Alekseev, I. Y. and Kozlova, O. V. (2002). Starspots and active regions on the emission red dwarf star LQHydrae. A&A, 396:203–211.

Alekseev, I. Y. and Kozlova, O. V. (2003). Starspots and active regions on the chromospherically activebinary MS Ser. A&A, 403:205–215.

Kawka, A., Vennes, S., Koch, R., and Williams, A. (2002). Optical Observations and Orbital Parameters ofthe Close DA plus dMe Binaries BPM 71214, EUVE J0720-31.7, BPM 6502, and EC 13471-1258.Astronomy and Astrophysics, 124:2853–2867.

Korhonen, H., Brogaard, K., Holhjem, K., Ramstedt, S., Rantala, J., Thone, C. C., and Vida, K. (2007).Photospheric and chromospheric activity on ey dra. Astronomische Nachrichten, 328(9):897.

Lanza, A. F., Catalano, S., Cutispoto, G., Pagano, I., and Rodono, M. (1998). A&A.

O’Donoghue, D., Koen, C., Kilkenny, D., Stobie, R. S., Koester, D., Bessell, M. S., Hambly, N., andMacGillivray, H. (2003). The DA+dMe eclipsing binary EC13471-1258: its cup runneth over ... just.MNRAS, 345:506–528.

Schaifers, K. and Voigt, H. H. (1982). 4.2.5.16 the cousins (cape) vri color system. 2b:82.

Spruit, H. (1998). Fast maximum entropy doppler mapping. ArXiv Astrophysics e-prints.

Watson, C. A. and Dhillon, V. S. (2001). MNRAS.


Studying activity in Pre-CVs secondaries: The case of ... · A hibernating CV? Tiago Ribeiro,...

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