c iv

e-mail: [email protected] [email protected]://www.cc.uoa.gr/fasma

University of Athens, Faculty of Physics, Department of Astrophysics, Astronomy and MechanicsAstronomical Observatory of Belgrade

Long term variability of the

coronal and post – coronal

regionsof the Oe star

HD 149757 (ζ Oph)

Antoniou, A.1, Danezis, E.1, Lyratzi, E.1, Nikolaidis, D.1, Popović, L. Č.2 &

Dimitrijević, M. S.2

1. University of Athens, Faculty of Physics, Department of

Astrophysics, Astronomy and Mechanics, Panepistimioupoli,

Zographou 157 84,Athens – Greece.

2. Astronomical Observatory, Volgina 7, 11160 Belgrade,

Serbia.



C IV N IV N Vλ 1548.155 Åλ 1550.774 Å

λ 1238.821 Åλ 1242.804 Å

λ 1718.80 Å



Vrot, Vrad, Vrand: Constant with time

Rotational Velocities:a component: 1400 km/sb component: 950 km/sRadial Velocities:a component: -800 km/s b component: -700 km/sRandom Velocities:a component: 320 km/s b component: 90 km/s

C IV regions



Column Density (CD) in 1010 cm-2 of each one of the C IV resonance lines for the independent density regions of matter which create the satellite components.

λ 1548.155 Åa component: 2.15×1010 cm-2

b component: 0.72×1010 cm-2

λ 1550.774 Åa component: 1.98×1010 cm-2




N IV region

GR methodVrad, Vrand, CD: Constant with time

Radial Velocities: -47 km/s

Random Velocities: 262 km/s

Column Density: 1.09×1010 cm-2



N V regions

GR methodVrad, Vrand: Constant with time

Radial Velocities:a component: -1138 km/s b component: -1374 km/sc component: -1450 km/s

Random Velocities:a component: 797 km/s b component: 152 km/sc component: 71 km/s



Column Density (CD) in 1010 cm-2 of each one of the N V resonance lines for the independent density regions of matter which create the satellite components.

λ 1238.821 Åa component: 1.13×1010 cm-2


c component: 0.07×1010 cm-

2

λ 1242.804 Åa component: 1.03×1010 cm-2


c component: 0.06×1010 cm-

2



A statistical study of physical

parameters of the C IV density regions in 20 Oe

stars Antoniou, A.1,

Danezis, E.1, Lyratzi, E.1, Nikolaidis, D.1, Popović, L. Č.2 &


1. University of Athens, Faculty of Physics,

Department of Astrophysics, Astronomy and Mechanics,

Panepistimioupoli, Zographou 157 84,

Athens – Greece.2. Astronomical Observatory, Volgina 7, 11160 Belgrade,

Serbia.



Rotational Velocities:a component: 1458 km/sb component: 821 km/sc component: 251 km/sd component: 133 km/s e component: 65 km/s

Radial Velocities:a component: -2066 km/sb component: -1743 km/sc component: -1235 km/s d component: -469 km/s e component: -80 km/s



Random Velocities:a component: 187 km/sb component: 163 km/sc component: 130 km/sd component: 108 km/s e component: 56 km/s

FWHM:a component: 13.0 Åb component: 6.2 Åc component: 2.2 Åd component: 1.2 Å e component: 0.4 Å



Absorbed Energy (E)

λ 1238.821 Åa component: 5.18 eVb component: 3.21 eVc component: 1.39 eVd component: 0.53 eVe component: 0.24 eV

λ 1242.804 Åa component: 4.76 eVb component: 2.85eVc component: 1.26 eVd component: 0.48 eV e component: 0.22 eV



Column Density (CD)

λ 1238.821 Åa component: 5.65 ×1010 cm-2

b component: 4.58 ×1010 cm-2

c component: 3.65 ×1010 cm-2

d component: 2.62 ×1010 cm-2

e component: 1.17 ×1010 cm-2

λ 1242.804 Åa component: 5.54 ×1010 cm-2

b component: 4.39 ×1010 cm-2

c component: 3.56 ×1010 cm-2

d component: 2.56 ×1010 cm-2

e component: 1.17 ×1010 cm-2



The N IV region in the spectra of 20 Oe stars

Antoniou, A.1, Danezis, E.1, Lyratzi, E.1, Nikolaidis, D.1, Popović, L. Č.2 &






Serbia.



Two levels of Vrad, Vrand, FWHM

Radial VelocitiesFirst level: -350 and -150 km/sSecond level: -70 km/sRandom VelocitiesFirst level: 350 and 220 km/sSecond level: 150 and 50 km/sFWHMFirst level: 5 and 3 ǺSecond level: 2 and 1 km/s Ǻ



Two levels of Absorbed Energy and Column Density

Absorbed Energy (E)First level: 2 and 1.2 eVSecond level: 0.6 and 0.4 eV

Column Density (CD)First level: 4.5×1010 cm-2 and

3×1010 cm-2 Second level: 2.5×1010 cm-2



Investigation of the post coronal density regions

of Oe stars,through the N V UV resonance

lines Antoniou, A.1,

Danezis, E.1, Lyratzi, E.1, Nikolaidis, D.1, Popović, L. Č.2 &






Serbia.



Vrot: 1st level: 1800 and 1100 km/s2nd level: 400 and 200 km/s

Vrad:1st level: -2300 and -1500 km/s2nd level: -500 and -100 km/s

Vrand: 1st level: 400 and 200 km/s2nd level: 150 and 80 km/s

FWHM: 1st level: 18 and 10 Å

2nd level: 6 and 2 Å



Two levels of Absorbed Energy (E)

λ 1238.821 ÅFirst level: 7 and 3 eVSecond level: 1 and 0.5 eV

λ 1242.804 ÅFirst level: 6.3 and 2.7 eVSecond level: 0.9 and 0.45 eV



Two levels of Column Density (CD)

λ 1238.821 ÅFirst level:5×1010 cm-2 and 3×1010 cm-2 Second level: 2.5×1010 cm-2

λ 1242.804 ÅFirst level: 4.45×1010 cm-2 and

2.7×1010 cm-2 Second level: 2×1010 cm-2



Thank you!!!

c iv

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