rr lyrae stars: new discoveries in the ogle data · rr lyrae stars: new discoveries in the ogle...

IAU General Assembly 2015

Focus Meeting 17: Advances in Stellar Physics from Asteroseismology

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RR Lyrae stars: new discoveries in the OGLE data

Radosław Smolec (CAMK PAN, Warsaw)

Henryka Netzel (Warsaw University)

Igor Soszynski (Warsaw University)

I Warsaw University project

I now OGLE-IV (since 2010)

I more than 100k classical pulsatorsin LMC, SMC and Galactic bulge

photo: www.astrouw.edu.pl

RR Lyrae stars: new discoveries in the OGLE data 1

Optical Gravitational Lensing Experiment, OGLE, 1992–

Honolulu, IAU GA, FM17: Advances in Stellar Physics from Asteroseismology, 12-14.08.2015

-0.4

-0.2

0

0.2

0.4

0.6

0.8

1

1.2

1.4

5200 5400 5600 5800 6000 6200 6400 6600 6800

∆I [

mag

]

time [d]

Soszynski et al. (2014), Smolec et al. (2015)


Blazhko Effect in double-mode RR Lyr stars


-0.4

-0.2

0

0.2

0.4

0.6

0.8

1

1.2

1.4

5200 5400 5600 5800 6000 6200 6400 6600 6800

∆I [

mag

]

time [d]

0.720

0.725

0.730

0.735

0.740

0.745

0.750

0.755

-0.50 -0.40 -0.30 -0.20

P1O

/PF

log PF

OGLE-IV Galactic bulge RRd stars

one, two, three,modulation periods

Soszynski et al. (2014), Smolec et al. (2015)

? majority of the modulatedRRd stars have atypical pe-riod ratio

? multiperiodic modulation ispresent




0 40 80

120

A0

[mm

ag]

F

0 40 80

120

5200 5400 5600 5800 6000 6200 6400 6600 6800 7000

A1

[mm

ag]

time [d]

1O

2

4

6

8

φ 0 [

rad]

F

-4

-2

0

2

5200 5400 5600 5800 6000 6200 6400 6600 6800 7000

φ 1 [

rad]

time [d]

1O

0

10

20

30

A [

mm

ag] PB2=322.9d

0 10 20 30 40

0 0.01 0.02

A [

mm

ag]

frequency [c/d]

PB1=209.8d

0 0.2 0.4 0.6 0.8

A [

rad]

0 0.2 0.4 0.6 0.8

0 0.01 0.02

A [

rad]

frequency [c/d]

0 40 80

120

A0

[mm

ag]

PB2

0 40 80

120

0 1 2

A1

[mm

ag]

phase

PB1

2

4

6

8

φ 0 [

rad]

PB2

-4

-2

0

2

0 1 2

φ 1 [

rad]

phase

PB1

? both radial modes may be modulated with the same period, but

? more commonly, dominant modulation for the fundamental mode has dif-ferent period than dominant modulation for the first overtone

?Smolec et al. (2015)




40

60

80

100

A [

mm

ag]

OGLE-III OGLE-IV

2

3

2500 3500 4500 5500 6500

φ [r

ad]

time [d]

F mode1O mode

? amplitudes and phases of theradial modes vary irregularlyon a long time-scale of a fewhundred or thousand days

? the short-term modulations arealso irregular

Smolec et al. (2015)




40

60

80

100

A [

mm

ag]

OGLE-III OGLE-IV

2

3

2500 3500 4500 5500 6500

φ [r

ad]

time [d]

F mode1O mode

0

40

80

120

A [

mm

ag]

OGLE-III OGLE-IV

F mode1O mode

-2

0

2

4

2500 3500 4500 5500 6500

φ [r

ad]

time [d]

? amplitudes and phases of theradial modes vary irregularlyon a long time-scale of a fewhundred or thousand days

? the short-term modulations arealso irregular

? OGLE-BLG-RRLYR-13442 hasswitched the pulsation mode(RRab→RRd; Soszynski et al.2014)

Smolec et al. (2015)




0.58

0.60

0.62

0.64

0.66

0.68

0.70

0.72

0.74

0.76

-0.60 -0.50 -0.40 -0.30 -0.20

PS/

PL

log PL

F+1O

F+2O

1O+?

F+1O: 1335.Soszynski et al. (2009,-10,-11)

F+2O: 9 stars.Chadid et al. (2009),

.Poretti et al. (2010),

.Benkö et al. (2010),

.Guggenberger et al. (2011)

1O+?: 23 stars.Gruberbauer et al. (2007)

.Olech & Moskalik (2009)

.Soszynski et al. (2009)

.Süveges et al. (2012)

.Moskalik et al. (2011, -15)

.Chadid (2012), Szabo et al. (2014)

.Molnar et al. (2015)


Non-radial modes in RR Lyr stars: 0.61–0.63 period ratio


0.58

0.60

0.62

0.64

0.66

0.68

0.70

0.72

0.74

0.76

-0.60 -0.50 -0.40 -0.30 -0.20

PS/

PL

log PL

F+1O

F+2O

1O+?













.Netzel, Smolec & Moskalik (2015a)




0.58

0.60

0.62

0.64

0.66

0.68

0.70

0.72

0.74

0.76

-0.60 -0.50 -0.40 -0.30 -0.20

PS/

PL

log PL

F+1O

F+2O

1O+?














.Smolec et al. (2015, Bl-RRd)




0.58

0.60

0.62

0.64

0.66

0.68

0.70

0.72

0.74

0.76

-0.60 -0.50 -0.40 -0.30 -0.20

PS/

PL

log PL

F+1O

F+2O

1O+?















.Jurcsik et al. (2015)




0.58

0.60

0.62

0.64

0.66

0.68

0.70

0.72

0.74

0.76

-0.60 -0.50 -0.40 -0.30 -0.20

PS/

PL

log PL

F+1O

F+2O

1O+?















.Jurcsik et al. (2015)

.Netzel, Smolec & Moskalik (2015b)




0.600

0.605

0.610

0.615

0.620

0.625

0.630

0.635

0.640

0.20 0.30 0.40

Px/

P1O

P1O [day]

Galactic bulge, Netzel et al.M3, Jurcsik et al.

• common form of RR Lyr pulsation:93% of RRc/RRd observed from space (13/14)

38% of M3 RRc/RRd stars (Jurcsik et al. 2015)

3% of OGLE-III Galactic bulge stars, but

27% in the two high cadence OGLE-IV fields

• three sequences in the Petersen dia-gram

up to three non-radial modes in a single star

• additional mode(s) must be non-radial

• subharmonics of additional mode(s)are present

• additional modes are non-stationary

Netzel, Smolec & Moskalik (2015a,b)




0.0

1.0

2.0

3.0

4.0

0.6 0.61 0.62 0.63 0.64P/P1O

OGLE-BLG-RRLYR-06610A (mmag)P1O=0.31623d

0.0

1.0

2.0

3.0

4.0OGLE-BLG-RRLYR-06802A (mmag)P1O=0.31830d

0.0

1.0

2.0

3.0


0.0

1.0

2.0

3.0


0.0

1.0

2.0

3.0


0.0

1.0

2.0

3.0

4.0OGLE-BLG-RRLYR-09305A (mmag)P1O=0.30295d • common form of RR Lyr pulsation:

93% of RRc/RRd observed from space (13/14)













0.56

0.58

0.6

0.62

0.64

0.66

0.68

0.2 0.25 0.3 0.35 0.4

P4O

/P1O

, P3O

/P1O

P1O [day]

Z=0.0001Z=0.001Z=0.01














0

0.002

0.004

0.6 0.61 0.62 0.63 0.64

OGLE-BLG-RRLYR-08597

0

0.002

0.004

1.2 1.22 1.24 1.26 1.28P/P1O














0.0

1.0

2.0

3.0

4.0

0.6 0.61 0.62 0.63 0.64P/P1O

all data

0.0

1.0

2.0

3.0

4.02013

0.0

1.0

2.0

3.0

4.02012

0.0

1.0

2.0

3.0

4.02011

0.0

1.0

2.0

3.0

4.0OGLE-BLG-RRLYR-07806

2010A (mmag)

P1O=0.31900d • common form of RR Lyr pulsation:93% of RRc/RRd observed from space (13/14)













0.58

0.60

0.62

0.64

0.66

0.68

0.70

0.72

0.74

0.76

-0.60 -0.50 -0.40 -0.30 -0.20

PS/

PL

log PL

F+1O

F+2O

1O+?

F+1O: 1335

F+2O: 9 stars

1O+?: 304 stars


New class of double-periodic RR Lyr stars: gravity mode pulsation?


0.58

0.60

0.62

0.64

0.66

0.68

0.70

0.72

0.74

0.76

-0.60 -0.50 -0.40 -0.30 -0.20

PS/

PL

log PL

F+1O

F+2O

1O+?

?+1O

F+1O: 1335

F+2O: 9 stars

1O+?: 304 stars

?+1O: 12 stars (11 OGLE+1 Kepler), Netzel, Smolec & Dziembowski (2015)

Period of the additional mode is longer than 1O period. It is longer thanperiod of the (undetected) F mode!




• dominant pulsation: radial first over-tone

• very narrow range of period ratios

• additional mode is always coherent

• it must be a non-radial mode of gra-vity (or mixed) character

• instability range extends slightly be-low F mode frequency, but no obviousselection mechanism can be propo-sed

Netzel, Smolec & Dziembowski (2015)




0.682

0.683

0.684

0.685

0.686

0.687

0.688

0.689

0.690

-0.5 -0.45 -0.4 -0.35 -0.3 -0.25 -0.2

P1O

/Px

log Px

0.68 starsKIC9453114

• dominant pulsation: radial first over-tone

• very narrow range of period ratios

• additional mode is always coherent

• it must be a non-radial mode of gra-vity (or mixed) character

• instability range extends slightly be-low F mode frequency, but no obviousselection mechanism can be propo-sed

Netzel, Smolec & Dziembowski (2015)





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rr lyrae stars: new discoveries in the ogle data · rr lyrae stars: new discoveries in the ogle...

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