MOST ST Meeting, Halifax, May 31 - June 1, 2010

Pulsation and Granulation in the two PMS stars

V 588 Mon and V 589 Monusing CoRoT data...

K. Zwintz, T. Kallinger, D. Guenther

MOST ST Meeting, Halifax, May 31 - June 1, 2010

V 588 Mon & V 589 Mon

• PMS members of NGC 2264

• Discovery of δ Scuti pulsation: Breger (1972)

• Recent Observations:

- multi-site campaign 2002

- MOST 2004: 48 days

- MOST 2006: 23 days

• First asteroseismic analysis:Guenther et al. (2009)

MOST ST Meeting, Halifax, May 31 - June 1, 2010

CoRoT & NGC 2264

• Dedicated short run (SRa01): March 2008 for ~23.4 days

• Exo field CCD

• 130 candidate targets for asteroseismology

• Additional: 14 „Imagettes“

- partially saturated images

- V 588 Mon & V 589 Mon

MOST ST Meeting, Halifax, May 31 - June 1, 2010

V 588 Mon seen with CoRoT

MOST ST Meeting, Halifax, May 31 - June 1, 2010

V 588 Mon seen with CoRoT

8 publishedpulsation frequencies(Guenther et al. 2009)

But there is more...

MOST ST Meeting, Halifax, May 31 - June 1, 2010

V 588 Mon: Comparison to MOST

close to orbit sidelobe

ok in MOST;not in gb data

MOST ST Meeting, Halifax, May 31 - June 1, 2010

V 589 Mon seen with CoRoT

MOST ST Meeting, Halifax, May 31 - June 1, 2010

V 589 Mon seen with CoRoT

published12 pulsation frequencies(Guenther et al. 2009)

And again: there is more...

MOST ST Meeting, Halifax, May 31 - June 1, 2010

Many additional frequencies...

V 588 Mon:106 „significant“

frequencies8 known frequencies

&98 „new“ frequencies

down to S/N=4

V 589 Mon:197 „significant“

frequencies

12 known frequencies&

185 „new“ frequenciesdown to S/N=4?

MOST ST Meeting, Halifax, May 31 - June 1, 2010

Granulation in A type stars

• Kallinger & Matthews (2010): 2 CoRoT targets

- power spectra: white noise + sum of power laws + Gaussian

> 1000 frequencie

spublished

420 frequenciespublished

55 frequencies

after granulation modelling

105 frequencies

after granulation modelling

MOST ST Meeting, Halifax, May 31 - June 1, 2010

Granulation in V588 Mon & V 589 Mon

• Prewhitening of the 10 / 15 largest amplitude frequencies

- Assumption: residual power excess is Gaussian-like

• Gaps in the data are filled by linear interpolation

- standard method for solar-type pulsators

• Global model fit to residual power spectrum

- power law components to correct the frequency-dependent background noise

- Signal-to-background-noise ratio (SNbR) to identify additional pulsation frequencies

MOST ST Meeting, Halifax, May 31 - June 1, 2010

Granulation Model for V 588 Mongap-filled residuals after prewhitening the 10 largest amplitude frequencies

solid line: global model fit

dotted line: 2 power laws and white noise

dashed lines: power lawsPeaks with SNbR > 9: significant additional pulsation frequencies

4 frequencies with SNbR > 9

MOST ST Meeting, Halifax, May 31 - June 1, 2010

Granulation Model for V 589 Mon

gap-filled residuals after prewhitening the 15 largest amplitude frequencies

22 frequencies with SNbR>9

MOST ST Meeting, Halifax, May 31 - June 1, 2010

• V 588 Mon

- 106 significant frequencies ⇒ 10 + 4 after granulation modelling

- one published frequency has SNbR < 9; but has to be included

- all 8 published frequencies are confirmed

Revised pulsation frequencies

• V 589 Mon

- 197 significant frequencies ⇒ 15 + 22 after granulation modelling

- all 12 published frequencies are confirmed

➡ Revised input for asteroseismic modelling

MOST ST Meeting, Halifax, May 31 - June 1, 2010

MOST & PMS stars:

Past and Future

MOST & PMS stars:

Past and Future

MOST ST Meeting, Halifax, May 31 - June 1, 2010

MOST & PMS stars in the past

• 5 Herbig Ae stars:HD 142666, UX Ori, HR 5999, V 1247 Ori, HD 34282

- the shortest period δ Scuti pulsator: HD 34282 (in prep.)

- the longest period δ Scuti pulsator: HR 5999(recent re-observations! to be published)

- no pulsational variability: UX Ori (in prep.)

- complex (pulsational) variabilities: HD 142666 (published)

- circumstellar matter ...

• NGC 2264 stars: no irregular variations

MOST ST Meeting, Halifax, May 31 - June 1, 2010

PMS stars - another view

A7e A7e

A7e

A5e

A3e

A3e

HR 5999 (2010)

MOST ST Meeting, Halifax, May 31 - June 1, 2010

Circumstellar matter in the 5 stars

• emission lines

• infrared excess

• circumstellar matter

- HD 142666 and UX Ori: “edge-on” & studied in detail

- HR 5999, V 1247 Ori and HD 34282: presence reported

MOST ST Meeting, Halifax, May 31 - June 1, 2010

The case of UX Ori

MOST ST Meeting, Halifax, May 31 - June 1, 2010

Spectral energy distributions

UX Ori

Work in progress...

MOST ST Meeting, Halifax, May 31 - June 1, 2010

PMS Target Proposal

• HD 35929

- RA = 05:27:42.8DE = -08:19:38.4

- V = 8.13 mag

- A5e

- single known period: 4.7 h

- switch target

- fundamental parameters available

GSC 05332-01468V = 9.7, sp = F2

GSC 05332-01325V = 10.2

Marconi et al. 2000

15‘

MOST ST Meeting, Halifax, May 31 - June 1, 2010

Why HD 35929?

• Herbig Ae star with similar spectral type to V 1247 Ori

- investigating the influence of the circumstellar matter with MOST

- check for additional pulsation frequencies at lower amplitudes

- similar to HR 5999 concerning length of pulsation period

‣ i.e. one of the longest period PMS pulsators

- fundamental parameters known (including parallax!)

- possibility for ground-based observations...